Rot Aqueduct
Land-Island Swamp (Rare)

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

When Rot Aqueduct enters the battlefield, sacrifice it unless you pay U.

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

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

Christopher Briclot