Sarker, Ospin Skullmauler

+1: Creatures you control get: "When this creature attacks, it deals damage equal to its toughness" until end of turn.
-3: Draw a card. If that card is a green or black creature, you gain 5 life. If the card is a noncreature card, you lose 1 life.
-6: Flip a coin. If heads, creatures you control get trample. If tails, creatures you control lose all abilities until end of turn.