dark contract

When dark contract enters the battlefield, you
lose a life, target opponent gains a life.
Whenever you cast a black spell, or a black
permanent dies, lose a life, draw a card, and
choose one:
•Creatures you control get -1/-0, and you lose a
life.
•Creatures you control get -0/-1, and you gain a
life.
Creatures you control have +1/+1, and lifelink.