Samut, the Driving Force is a rare Legendary Creature — Human Warrior Cleric card from Aetherdrift (DFT), collector number 222. Current market price: $0.20 (foil $0.27), TCGplayer market prices via Scryfall.
First strike, vigilance, haste Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.) Other creatures you control get +X/+0, where X is your speed. Noncreature spells you cast cost {X} less to cast, where X is your speed.