Terminal Agony is a common Sorcery card from Modern Horizons 2 (MH2), collector number 424. Current market price: $0.17 (foil $0.35), TCGplayer market prices via Scryfall.
Destroy target creature. Madness {B}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)