Sile, the Crooked Brother

+1: Draw two cards, then choose a card from your hand and put it on top of your library. Return up to X target permanents to their owner's hands.
+2: Until your next turn prevent all damage that would be dealt to you and planeswalkers you control. Exile up to X target permanents.
-4: Destroy all creatures. Create X*Y 1/1 white blue Human Merfolk creature token with exalted where Y is the number of creatures destroyed.