Scarlet Witch, Reality Shaper

Haste
Power Up (Whenever this creature deals combat
damage to a player, if it does not have a +1/+1
counter on it, put a +1/+1 counter on it.)
{t}, Remove a +1/+1 counter from Scarlet Witch: Scarlet Witch deals 4 damage to any target. If a creature dealt damage this way would die this
turn, exile it instead.