Kerrigan, Queen of Blades

+1: Put an infestation counter on target land. That land becomes a Swamp. Its controller loses 2 life.
-2: Create a 3/3 black Hydralisk creature token for each tapped land with an infestation counter on it.
-7: Destroy target creature. Then create X 2/1 black Zergling creature tokens with haste, where X is that creature's toughness.