Overcharged Fluxmage

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
At the beginning of your end step, flip X coins, where X is Overcharged Fluxmage's power. For each heads, draw a card. For each tails, Overcharged Fluxmage deals 2 damage to you.