Wolf Reaper

+4: Create 5 5/5 black wolf token with trample and if a Planeswalker you control dies destroy all wolfs on the battlefield.
-6: Gain control of target creature until a wolf you control dies.
-20: Choose one: Create 20 30/30 black wolf tokens with Trample, Flying and Infect. Create one 1/1 Wolf Pup.