Ravenous Trap is a uncommon Instant — Trap card from Zendikar (ZEN), collector number 109. Current market price: $0.35 (foil $3.15), TCGplayer market prices via Scryfall.
If an opponent had three or more cards put into their graveyard from anywhere this turn, you may pay {0} rather than pay this spell's mana cost. Exile target player's graveyard.