Davriel

+1: Create a 2/2 black demon creature token with either flying or deathtouch.
0: Create a token with "Sacrifice this token, take control of target spell with value equal or less than the number of loyalty counters on Davriel."
-6: Until the end of the turn, Davriel becomes a 7/7 creature with trample, double strike, and indestructable that's still a planeswalker.