Alda,r caller of storms

+1: Pick a creature. That creature takes 3 damage and the creatures side by side of it take 2 damage.
+3: Lose 2 life. You may cast a spell for 1 converted mana less until the end of turn.
-20: Flip a coin for each creature your opponents control. On heads destroy that creature. This planeswalker deals 10 damage to target player.