Emrys, King of Cats

+2: Put four 0/2 cat tokens onto the battlefield under your control. Draw a card.
-2: Swat at target opponent's deck. If 20 or more cards fall down, draw 7 cards. If less than 20 cards fall down, draw 3 cards.
-10: Pounce at target player. If they scream or shriek, destroy half of all permanents they control. If they don't, destroy 5 permanents they control.