Kroxa and Kunoros is a mythic Legendary Creature — Elder Giant Dog card from March of the Machine (MOM), collector number 245. Current market price: $0.41 (foil $0.52), TCGplayer market prices via Scryfall.
Vigilance, menace, lifelink Whenever Kroxa and Kunoros enters or attacks, you may exile five cards from your graveyard. When you do, return target creature card from your graveyard to the battlefield.