The Demogorgon

Haste, Menace
{1}{b}{t}: Exile target creature. You gain life equal to the exiled creatures toughness. Then if there are seven or more creatures exiled with The Demogorgon, You may search your library for The Mind Flayer and put it onto the battlefield tapped. Activate this ability only if a creature an opponent controls died this turn and only at any time you could cast a sorcery.
When The Demogorgon dies, return each card exiled with it to their owners hand.