Skeletal Castle
Land-Plains Swamp (Rare)

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

When Skeletal Castle enters the battlefield, sacrifice it unless you pay W.

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

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

Jason Chan