TLDR
Siege in MTG is a Battle subtype. You cast the front face, choose an opponent to protect it, then try to remove its defense counters so you can cast the back face for free.
The key rule is simple but strange at first: you usually attack your own Siege, while the chosen protector is the only player who can block creatures attacking it.
The best Siege cards are the ones where the front face is already useful, the back face is worth the extra combat effort, or both. Invasion of Ikoria, Invasion of Shandalar, Invasion of Tarkir, Invasion of Gobakhan, and Invasion of Zendikar are good starting points.
Understanding Siege In MTG
Siege cards ask you to think about combat a little differently. Instead of attacking only players or planeswalkers, you can attack a Battle. In the case of Siege cards, you often cast the Battle yourself, choose an opponent to protect it, then send creatures at your own permanent to unlock the back face.
The purpose of this guide is to explain how Siege mechanics work and recommend the Siege cards most worth testing. It is written for newer players, returning players, Commander players, Cube designers, casual brewers, and competitive-minded players who want to understand why some Battles are worth the effort and others are just fancy speed bumps.
Sieges show up most naturally in creature decks, Dragon decks, green value decks, aggressive white decks, and Commander lists that can turn a temporary board objective into long-term advantage. For casual testing, tools like PrintMTG can also help players try Siege-heavy decks before committing to a full paper list.
What Siege Is In MTG
A Siege is a subtype of Battle. Battle is the card type. Siege is the current Battle subtype that defines how the Battle is attacked, protected, and defeated.
When a Siege enters the battlefield, it enters with defense counters equal to the defense number printed in the lower-right corner of the front face. Damage dealt to the Battle removes that many defense counters. When the last defense counter is removed from a Siege, its intrinsic triggered ability triggers: the controller exiles it, then may cast it transformed without paying its mana cost.
That last part matters. A Siege does not simply flip over on the battlefield. It is exiled, then cast from exile transformed. Because it is cast, the transformed spell uses the stack and can be countered. If the back face is a permanent, it enters the battlefield if it resolves. If the back face is an instant or sorcery, it resolves like that spell type normally would.
The clean mental model is:
- Cast the Siege.
- Choose an opponent as protector.
- Attack or damage the Siege.
- Remove all defense counters.
- Exile it.
- Cast the back face transformed for free.
That is the little puzzle every Siege asks you to solve.
Who Can Block: Only A Battle’s Protector
The protector and the controller are not the same thing. The controller is usually the player who cast the Siege. The protector is the opponent chosen as the Siege enters.
For Sieges, the protector must be one of the controller’s opponents. Every player except the protector may attack that Siege. Only the protector may block creatures attacking it.
In a normal two-player game, this means you cast a Siege, choose your opponent to protect it, then you can attack your own Siege. Your opponent can block those attacking creatures because they are the protector.
In multiplayer, the politics get more interesting. Other players besides the protector may also attack your Siege. That can help you transform it, which means opponents may avoid attacking it unless the back face is harmless to them or the table wants the front face gone for some unusual reason.
The important distinction is this: controlling the Battle does not let you block for it. Protecting the Battle does.
How Blocking And Damage Work Against Battles
Creatures attack Battles during combat in much the same way they attack players or planeswalkers. When an unblocked creature deals combat damage to a Battle, that damage removes defense counters. If a 4/4 creature hits a Siege, four defense counters are removed.
Noncombat damage also works. A spell or ability that says it deals damage to “any target” can target a Battle. A spell or ability that specifically says it can damage a Battle can also do so. A spell that only says “target creature,” “target player,” or “target planeswalker” cannot target a Battle unless another effect changes what it can target.
This is why cards with flexible targeting are better with Sieges. A burn spell that can hit any target can clear a blocker, finish a protector, or remove the last defense counters from your own Siege.
If you want to defeat your Siege cleanly, choose the protector carefully. Pick the opponent with the least useful blocking board, the most tapped creatures, or the least incentive to spend resources defending it. Evasive creatures, menace, trample, tap effects, and removal all help you single out a Siege and push damage through.
If you are the protector, your job is the opposite. Block with creatures that trade well, remove attackers before combat damage, or use instant-speed interaction to keep the final counters from disappearing at the wrong time.
Battles And Double-Faced Cards
Battle is a full card type, like creature, planeswalker, enchantment, or artifact. Sieges are currently the recurring Battle subtype, and the official rules note that all currently existing Battles have the subtype Siege.
Battles are easiest to compare to planeswalkers, but the comparison only goes so far. Both can be attacked. Both can be damaged. Both create a separate combat decision beyond attacking a player.
The difference is motivation. With a planeswalker, you usually protect your own permanent and attack your opponent’s. With a Siege, you often attack your own permanent because defeating it unlocks the back face.
That creates a nice deckbuilding question: is the front face worth casting on its own, and can your deck reliably finish the Battle?
Double-Faced Cards
Most Siege cards are double-faced cards. The front face is the Battle. The back face can be a creature, enchantment, artifact, or even a sorcery, depending on the card.
A double-faced card has two faces, each with its own characteristics. Outside the battlefield or stack, a nonmodal double-faced card normally has only the characteristics of its front face. By default, a double-faced spell is cast with its front face up. For Siege cards, that means you normally cast the Battle side first.
Mana value can be unintuitive. For a transformed nonmodal double-faced permanent, the back face’s mana value is calculated using the mana cost of the front face. So even if the back face has no printed mana cost, it does not automatically have mana value zero.
Transforming Double-Faced Cards
Transforming double-faced cards normally enter front face up unless an effect says otherwise. Sieges use a specific exile-then-cast sequence when defeated. The Battle is not transformed in place. It leaves the battlefield, goes to exile, then the controller may cast the back face transformed without paying its mana cost.
It also helps to separate triggered effects from replacement effects.
The defense counters are created by an intrinsic replacement effect as the Battle enters. The “cast it transformed” instruction is a triggered ability that triggers when the last defense counter is removed. If a Battle somehow has zero defense counters without the last counter being removed, the normal Siege transform trigger may not happen. It can simply be put into its owner’s graveyard by state-based actions.
That is a small corner case, but it explains why the exact words “last defense counter is removed” matter.
Examples And Card Breakdowns
Invasion Of Ikoria // Zilortha, Apex Of Ikoria
Invasion of Ikoria is one of the clearest examples of a high-impact Siege. The front face costs XGG and searches your library and/or graveyard for a non-Human creature card with mana value X or less, then puts it directly onto the battlefield. If you searched your library, you shuffle.
That is already powerful. Creature tutors that put the card straight into play are rare, and this one scales from early utility creatures to late-game monsters. In Commander, it can find value engines, combo pieces, protection creatures, or finishers. In Cube, it plays like a flexible green tutor with an upside objective stapled to it.
The back face, Zilortha, Apex of Ikoria, is an 8/8 green legendary Dinosaur with reach. It lets each non-Human creature you control assign combat damage as though it were not blocked. That means a board full of non-Human attackers can suddenly push damage in a way blockers do not handle cleanly.
Best homes: green creature combo, Commander toolbox decks, non-Human creature decks, Cube ramp, and any list that can remove counters or attack for six damage without slowing down too much.
Main caveat: Invasion of Ikoria is strongest when the tutor target matters immediately. If you cast it only as a slow creature search spell and cannot defeat it, you are missing a lot of the card’s ceiling.
Invasion Of Shandalar // Leyline Surge
Invasion of Shandalar is a slower, grindier Siege. The front face returns up to three target permanent cards from your graveyard to your hand. That makes it useful in green midrange, Commander, and value decks that expect permanents to die naturally over a longer game.
The back face, Leyline Surge, is an enchantment that can put a permanent card from your hand onto the battlefield at the beginning of your upkeep. That is a huge payoff if you are holding expensive creatures, planeswalkers, enchantments, or artifacts.
The card has a clear rhythm: first it reloads your hand, then it threatens to cheat those permanents into play. In slower Commander games, that is exactly the kind of value loop green decks enjoy.
Best homes: green Commander value, graveyard decks, permanent-heavy ramp, battlecruiser casual decks, and decks that can protect or quickly defeat a four-defense Siege.
Main caveat: it costs five mana and does not affect the board defensively unless your graveyard already has good targets. In fast formats, that can be too much setup.
Invasion Of Tarkir // Defiant Thundermaw
Invasion of Tarkir is built for Dragon decks. The front face costs 1R and lets you reveal any number of Dragon cards from your hand. It then deals X plus 2 damage to any other target, where X is the number of Dragon cards revealed. X can be zero, so it still deals two damage even with no Dragons revealed.
That makes it flexible. Early, it can pick off a small creature or damage another Battle. In Dragon-heavy decks, it can scale into real removal.
The back face, Defiant Thundermaw, is a 4/4 red Dragon with flying and trample. Its attack trigger rewards Dragon boards by dealing 2 damage to any target whenever a Dragon you control attacks. That includes itself and any other attacking Dragon.
Best homes: Dragon Commander decks, casual red midrange, Dragon tribal Cube packages, and any deck already built to reveal or attack with Dragons.
Main caveat: if your deck has only a few Dragons, Invasion of Tarkir becomes a two-mana shock effect attached to a Battle that may be hard to defeat. The more Dragons you run, the more natural it feels.
Best Siege MTG Cards
The best Siege MTG cards tend to pass at least one of three tests: the front face is efficient, the back face can win or snowball, or the deck already wants to attack.
1. Invasion Of Ikoria
Best overall for raw ceiling. It tutors a non-Human creature directly onto the battlefield and turns into a massive finisher. Great in Commander and creature-combo shells.
2. Invasion Of Gobakhan
Best for low-curve white decks. The front face taxes a key card from the opponent’s hand, and the back face, Lightshield Array, rewards aggressive boards with counters and protection. It is the kind of Siege that fits a deck already planning to attack early.
3. Invasion Of Tarkir
Best tribal payoff. Dragon decks get removal up front and a Dragon payoff on the back. It is narrow, but strong in the right shell.
4. Invasion Of Shandalar
Best recursion Siege for slower games. Returning up to three permanents can restock your hand, and Leyline Surge can bury opponents if it survives to your upkeep.
5. Invasion Of Zendikar
Best simple ramp Siege. Searching for two basic lands is useful in casual, Commander, and Limited-style environments. The back face gives you a creature body after the ramp has already done its job.
6. Invasion Of Innistrad
Best instant-speed removal Siege. Flash plus a major toughness reduction effect gives black decks a real interaction spell first, with a token-making enchantment on the back if you can defeat it.
7. Invasion Of Tolvada
Best reanimation-style value. Returning a nonbattle permanent from the graveyard to the battlefield gives it a high floor in decks that care about recursion.
8. Invasion Of Arcavios
Best spell-toolbox Siege. It can search for an instant or sorcery from several zones, including outside the game where allowed, which makes it appealing for spell-heavy decks and more formal sideboard environments.
For most players, Invasion of Ikoria, Invasion of Shandalar, and Invasion of Tarkir are the first three to test because their deck identities are clear. Ikoria wants creature tutoring and big attacks. Shandalar wants graveyard value and permanents. Tarkir wants Dragons.
Strategic Tips For Playing Sieges
Choose The Protector Carefully
Do not choose the protector randomly. In a two-player game, you have no choice about which opponent protects it. In multiplayer, choose the opponent least able or least willing to block.
Look for tapped creatures, small creatures, low life totals, political pressure, or opponents who would rather save blockers for someone else. A Siege is easier to defeat when the protector is already under pressure.
Treat The Front Face As The Floor
A good Siege should do something useful even if it never transforms. Invasion of Ikoria finds a creature. Invasion of Shandalar reloads your hand. Invasion of Tarkir deals damage. Invasion of Zendikar ramps.
If the front face is weak and the back face is hard to reach, the card probably belongs in a very specific synergy deck, not a general list.
Time The Transformation
Sometimes you want to defeat a Siege immediately. Sometimes you want to wait.
If the back face is a creature, defeating the Siege before combat may let you attack with the transformed creature only if it has haste or was already under your control continuously, which usually will not be the case because it is a newly cast permanent. If the back face is an enchantment or artifact, timing may depend on when its triggered ability will matter.
Also remember that the transformed spell can be countered. When possible, defeat an important Siege when opponents are tapped out or short on interaction.
Use The Right Removal Against Opposing Sieges
Damaging an opponent’s Siege usually helps them. If you want to deny the payoff, remove the Battle without removing the last defense counter.
Good answers are spells that can target a permanent, nonland permanent, or Battle directly. Bounce spells can also reset the Siege. Counterspells can stop the original Battle spell or the transformed spell after the Siege is defeated.
Proliferate and other counter-adding effects can also make a Siege harder to defeat by adding defense counters. It is not flashy, but it can buy a turn when the back face is scary.
Future Battles
The Battle card type has room to grow. The rules already make Battle subtypes important, and Wizards’ original Battle explanation pointed toward the possibility of future subtypes with different combat rules.
Future Battle designs could move in several directions:
- Battles your opponent controls but you want to protect.
- Battles that both players can attack for different rewards.
- Multiplayer Battles that create table-wide objectives.
- Battles with time counters, chapter-like progression, or team-based protection.
- Siege-like cards that reward defense rather than offense.
The balance challenge is real. Battles add a new object to combat, and too many board objectives can slow the game down. Future Battles need clear incentives, clean board states, and rewards that justify the extra decision-making.
Siege worked because the basic story was easy to understand: invade a plane, fight through its defenses, and reveal what survives on the other side. Future Battle subtypes will need that same clarity.
FAQ And Common Rules Interactions
Who controls the transformed Siege after it resolves?
The controller of the Siege controls the triggered ability that exiles it and allows it to be cast transformed. If that player casts the back face and it resolves as a permanent, it enters under that player’s control. The physical card is still owned by its owner.
Can you attack your own Siege?
Yes. In fact, that is the normal play pattern for Sieges. A Siege’s protector can never attack it, but other players can. Since the Siege’s controller chooses an opponent as protector, the controller can usually attack their own Siege.
Can the protector block creatures attacking a Siege?
Yes. Only the protector can block creatures attacking that Battle. Other players, including the Battle’s controller, cannot block those attackers.
Can spells damage Battles?
Yes, but the wording matters. A spell or ability that says “any target” can target a Battle. A spell or ability that specifically says it can target or damage a Battle can also work. Damage removes that many defense counters.
Do noncombat damage and counter removal transform a Siege?
They can. Any damage dealt to a Battle removes that many defense counters. Effects that remove defense counters can also cause the last defense counter to be removed. The key is that the last defense counter must actually be removed for the Siege trigger to happen.
What happens if a Siege has zero defense counters but the last counter was not removed?
If a Battle has defense 0 and is not the source of a relevant triggered ability still on the stack, it is put into its owner’s graveyard as a state-based action. That is different from defeating it by removing the last defense counter.
Do you have to cast the transformed back face?
No. The Siege ability says you may cast it transformed without paying its mana cost. If you choose not to cast it, or if you cannot legally cast it, it remains in exile.