Anastasia, Tarnished Eater

Lifelink, Invader (whenever a creature with Invader attacks, choose target creature an opponent controls
to block it. It can't be blocked by more than one
creature.)

Whenever a creature dealt damage by Anastasia, Tarnished Eater dies, put two +1/+1 counters on Anastasia.

When you gain life, you may instead lose that life
and draw that many cards.