Pinecrest Ruins
Land-Swamp Forest (Rare)

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

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

GG, Tap, Sacrifice Pinecrest Ruins: Destroy target artifact.

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

Douglas Palck