Grusilda, Monster Masher is a rare Legendary Creature — Zombie Villain card from Unstable (UST), collector number 132. Current market price: $0.31 (foil $1.58), TCGplayer market prices via Scryfall.
Combined, enchanted, and equipped creatures you control have menace. {3}{B}{R}, {T}: Put two target creature cards from graveyards onto the battlefield combined into one creature under your control. (Its power is equal to their total power, its toughness is equal to their total toughness, and it has their names, mana costs, types, text boxes, etc.)