Tiamat of Storms

+1: Creatures you control get -1/-1 until end of turn. If a creature you control dies this turn deal 2 damage to one target.
+3: Creature you control get -2/-2 until end of turn. For every creature of yours that dies this turn put a +2/+2 counter on Tiamat of Storms.
-20: Deal 10 damage each to any number of creatures and/or players. All players discard their hands and draw 7 new cards.