Yggdrasil, Rebirth Engine is a mythic Legendary Artifact card from Assassin's Creed (ACR), collector number 78. Current market price: $1.34 (foil $1.62), TCGplayer market prices via Scryfall.
When Yggdrasil enters, exile all creature cards from your graveyard. {T}: Exile the top three cards of your library. {4}, {T}: Put a creature card exiled with Yggdrasil onto the battlefield under your control. It gains haste until end of turn. Activate only as a sorcery.