Masticore is a rare Artifact Creature — Masticore card from Urza's Destiny (UDS), collector number 134. Current market price: $38.28 (foil $382.82), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, sacrifice this creature unless you discard a card. {2}: This creature deals 1 damage to target creature. {2}: Regenerate this creature.