Eshki, Temur's Roar (Borderless) [Tarkir: Dragonstorm Commander]

Whenever you cast a creature spell, put a+1/+1 counter on Eshki. If that spell's power is 4 or greater, draw a card. If that spell's power is 6 or greater, Eshki deals damage equal to Eshki's power to each opponent.