Throes of Chaos

Spectacle {b/r}{b/r}{b/r}{b/r}{b/r}
Cascade, Dredge 3, Delve, Retrace
Choose a creature target opponent controls named Samuel, then choose target creature. Exile them, then you gain life equal to their converted mana cost. Gain control of target creature an opponent controls with a converted mana cost equal to the number of instants and sorceries in your graveyard.