Ebony Maw

Extort {w/b} (Whenever you cast a spell, you may
pay {w/b} If you do, each opponent loses 1 life and
you gain that much life.)
Spectacle {2}{w/b}{w/b}{w/b} (You may cast this spell for its spectacle cost rather than its mana cost if an opponent
lost life this turn.)
When Ebony Maw enters the battlefield, if Ebony
Maw's spectacle cost was paid, you control target players next turn.