Alaniel, Avenging Seraph

Flying, lifelink, ward {3}
Afflict 2 (Whenever this creature becomes blocked, defending player loses 2 life.)
Whenever your opponent commits a crime, Alaniel, Avenging Seraph deals 3 damage to that player unless they sacrifice a nontoken creature. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)

"That's going to cost you... just about everything, actually."