Coral Mire
Land-Island Swamp (Rare)

(Tap: Add U or B to your mana pool.)

When Coral Mire enters the battlefield, sacrifice it unless you pay U.

1, Tap: Target land becomes a 2/2 blue Illusion creature until end of turn. It's still a land.

Tap, Sacrifice a Swamp: Add BB to your mana pool.

Eric Spencer