Deathly Castle
Land-Plains Swamp (Rare)

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

When Deathly Castle enters the battlefield, return a land you control to its owner's hand.

1BB, Tap, Sacrifice Deathly Castle: Target player discards a card.

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

Steve Critchlow