Sven, Eternal Ice

+1: Place a Shield Token on the target creature
-2: Donate a creature. Create an X+3/X+3 Snow Elemental, where X is the stamina of a sacrificed creature with a Shield Token on it.
-10: Destroy all the permanents, ignoring all interfering properties. Sven, Eternal Ice becomes a 6/6 creature with Indestructibility.