Coral Depths
Land-Island Swamp (Rare)

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

Coral Depths enters the battlefield tapped.

2, Tap: Target land becomes a 3/3 blue Merfolk Cephalid creature until end of turn. It's still a land.

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

Carl Grant West