Collapsing Borders is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Domain — At the beginning of each player's upkeep, that player gains 1 life for each basic land type among lands they control. Then this enchantment deals 3 damage to that player.
Complete guide
Collapsing Borders is a fiery Domain enchantment that forces every player to reconcile their relationship with the land. It rewards those who diversify their mana base with life while simultaneously scorching everyone for a fixed amount of damage. This card creates a ticking clock that can be mitigated by careful land selection.
Understanding Domain
The Domain keyword checks the number of basic land types among lands a player controls. There are five basic land types: Plains, Island, Swamp, Mountain, and Forest. Even if a land is not a 'Basic Land' (like a Ravnica Dual Land), it counts toward this total as long as it possesses one or more of those specific subtypes. Other types like Desert or Gate do not count.
Resolution Step-by-Step
The ability triggers at the beginning of each player's upkeep. First, the game counts the number of basic land types the active player controls. Second, that player gains 1 life for each of those types (ranging from 0 to 5). Finally, Collapsing Borders deals 3 damage to that same player. These events happen in sequence, so a player at 1 life might survive if they gain enough life before the damage is dealt.
Common Pitfalls
A common mistake is assuming the damage scales with the lands; the damage is always a flat 3. Another error is counting the number of lands instead of the number of types. If you control three Mountains, you only gain 1 life because you only have one basic land type (Mountain). You need a variety of types to break even or come out ahead.
When to Play It
This card is ideal for five-color decks that can consistently reach a full Domain count of 5. In such a deck, you will gain 5 life and take 3 damage, resulting in a net gain of 2 life per turn. Meanwhile, an opponent with only one or two land types will suffer a net loss of life every turn, eventually burning out.
Interaction examples
At the start of your upkeep, the trigger goes on the stack. If you control two Mountains and a Forest, the ability sees two basic land types. You gain 2 life, then Collapsing Borders deals 3 damage to you. You have net lost 1 life.
Shared AnimosityWhile Shared Animosity powers up your tribal attackers, Collapsing Borders acts as a secondary clock. If your opponent is playing a mono-colored deck, they will likely take 2 net damage every turn (1 life gained minus 3 damage), putting them into range for your buffed creatures to finish the job.
Aggravated AssaultUsing Aggravated Assault to take extra combat phases requires a lot of mana. If you have a full Domain of 5 basic land types, Collapsing Borders nets you 2 life every turn. This extra life cushion allows you to safely pay costs or survive counter-attacks as you spend your mana on additional combat phases to close out the game.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Collapsing Borders
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Domain abilities count the number of basic land types among lands you control, not how many lands you control or how many of any type.
No other card is named in this ruling.
- #2· Wizards of the Coast
The basic land types are Plains, Island, Swamp, Mountain, and Forest. Land types other than basic land types (such as Desert) don't contribute to domain abilities.
No other card is named in this ruling.
Legal formats
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Meta decks with Collapsing Borders
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