Wyll, Slayer of Fiends

First strike

Mizora's Pact —Whenever Wyll, Slayer of Fiends
blocks or is blocked by a Devil, Imp, or Tiefling,
Wyll gains +2/+2 until end of turn.

Whenever Wyll deals combat damage to a creature
that reduces that creature's toughness to 0, put a
+1/+1 counter on Wyll.