Benvolio, the Gambler

0: Flip a coin. If you win the flip, put two loyalty counters on Benvolio. If you lose the flip, remove a loyalty counter from Benvolio.
-1: Discard up to two cards, then draw that many cards.
-6: Flip ten coins. For each flip you win, add {r} and exile the top card of your library. You may play cards exiled this way this turn.