Tannuk, Steadfast Second is a mythic Legendary Creature — Kavu Pilot card from Edge of Eternities Promos (PEOE), collector number 162s. Current market price: — (foil $5.91), TCGplayer market prices via Scryfall.
Other creatures you control have haste. Artifact cards and red creature cards in your hand have warp {2}{R}. (You may cast a card from your hand for its warp cost. Exile that permanent at the beginning of the next end step, then you may cast it from exile on a later turn.)