Abel, Unwilling Servant

Hex — When Abel, Unwilling Servant becomes blocked, the blocking creature's controller
sacrifices a creature or loses 2 life.
Thirsting Blade — When an opponent sacrifices a creature, Abel, Unwilling Servant gains +1/+1.
{1}{b}{b} Sacrifice a creature, then return Abel, Unwilling Servant from your graveyard to your
hand.