Doomblade Slicer

When Doomblade Slicer enters the battlefield,
you may pay {1}{b}. If you do, destroy target
nonblack creature.
When Doomblade Slicer is blocked, defending
player chooses one that hasn't been chosen:
• Attacking players gain 3 life and you lose 3 life.
• Sacrifice a creature
• Discard a nonland card.
{bull} Lose 9 life.