Guts, Hundred Man Slayer

-1: Guts, Hundred Man Slayer destroy a creature you control. You draw X cards, being X that creature cost.
0: Guts, Hundred Man Slayer deals 6 damage to target player unless he or she sacrifice a creature.
: If an opponent or planeswalker lost life this turn, you may transform Guts, Hundred Man Slayer.