Sorcery, 2BB (4)
Rare
All creatures get -1/-1 until end of turn for each Swamp you control.
Liliana developed a fondness for the moment when roaring becomes squealing.
Illus. Zoltan Boros & Gabor Szikszai

7/1/2012: The effect is based on the number of Swamps you control when Mutilate resolves. Only creatures on the battlefield at that time will be affected. The effect won't change later in the turn, even if the number of Swamps you control changes.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern