Coral Colony 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
Defender,
: Target player mills X cards, where X is the number of creatures you control with defender. (To mill a card, a player puts the top card of their library into their graveyard.)
Complete guide
Coral Colony is a blue creature that turns your defensive lineup into a potent library-depleting engine. As a Wall with defender, it keeps you safe while preparing to mill your opponents out of the game.
The Power of Defense
Coral Colony scales its power based on how many creatures you control with the defender keyword. When you activate its ability, it counts every creature you have on the battlefield with defender, including itself, to determine how many cards the target player must move from the top of their library to their graveyard.
Step-by-Step Resolution
First, you pay the cost of one blue and one generic mana and tap Coral Colony to put the ability on the stack. When the ability resolves, the game checks how many creatures with defender you currently control. If you gained or lost defenders while the ability was waiting to resolve, only the final number at the moment of resolution matters. Finally, the target player mills that many cards.
Common Pitfalls
A frequent mistake is calculating the X value when you activate the ability; remember that the official rulings state X is only determined as the ability resolves. Additionally, keep in mind that Coral Colony has defender itself, so as long as it remains on the battlefield when the ability resolves, X will be at least one.
Strategic Timing
Because the ability requires tapping, you must wait for summoning sickness to wear off unless the creature gains haste. It is best used at the end of your opponent's turn to maximize your defensive stance during their combat phase before utilizing your mana.
Interaction examples
If Coral Colony is your only creature on the battlefield when its ability resolves, the target player mills exactly one card because Coral Colony counts itself as a creature with defender.
Ornithopter of ParadiseIf you control Coral Colony and Ornithopter of Paradise, and you activate the colony's ability, the target player still only mills one card. Although Ornithopter of Paradise is a creature, it does not have the defender keyword, so it does not increase the value of X.
Foundry InspectorWith both Coral Colony and Foundry Inspector on the field, activating the colony results in the target player milling one card. Like the thopter, Foundry Inspector lacks defender. You must specifically add more creatures with the defender keyword to increase the mill count.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Coral Colony
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The number of creatures with defender you control is counted when the ability resolves.
No other card is named in this ruling.
Legal formats
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Meta decks with Coral Colony
No archived Top 8 deck with this card yet.