Tyvar, the Pummeler is a mythic Legendary Creature — Elf Warrior card from Duskmourn: House of Horror (DSK), collector number 202. Current market price: $14.82 (foil $15.98), TCGplayer market prices via Scryfall.
Tap another untapped creature you control: Tyvar gains indestructible until end of turn. Tap it. {3}{G}{G}: Creatures you control get +X/+X until end of turn, where X is the greatest power among creatures you control.