Bad Watchtower
Land-Plains Swamp (Rare)

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

At the beginning of your end step, if you didn't cast any spells this turn, Bad Watchtower deals 1 damage to you.

B, Tap, Pay 1 life: Put a 1/1 black Wizard Skeleton creature token onto the battlefield.

W, Tap, Sacrifice Bad Watchtower: Prevent all combat damage that would be dealt this turn.

James Tedin