Calciform Tomb
Land-Plains Swamp (Rare)

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

Calciform Tomb enters the battlefield tapped unless you control two or more creatures.

1W, Tap: Target creature gains vigilance until end of turn.

2, Tap: Target land becomes a 3/3 black Rat Specter creature until end of turn. It's still a land.

Justin Prescott