Imaryll, Elfhame Elite is a mythic Legendary Creature — Elf Warrior card from Game Night: Free-for-All (GN3), collector number 5. Current market price: — (foil $20.24), TCGplayer market prices via Scryfall.
Whenever Imaryll attacks, it gets +X/+X until end of turn, where X is the number of other Elves you control. You may have Imaryll assign its combat damage as though it weren't blocked.