Crater's Claws is a rare Sorcery card from Khans of Tarkir Promos (PKTK), collector number 106s. Current market price: — (foil $0.48), TCGplayer market prices via Scryfall.
Crater's Claws deals X damage to any target. Ferocious — Crater's Claws deals X plus 2 damage instead if you control a creature with power 4 or greater.