Jeffery the Unhinged

+2: Target permanent has, "When this card deals damage to a player, that player exiles cards from the top of their library equal to damage taken."
-3: Counter target non-creature, non-planeswalker spell or activated ability. You can use this ability any time you could cast an instant.
-6: Flip a nickel, let it land. If it's heads, copy target spell. If it's tails deal 6 damage to target player. If it's sideways you win the game.