Tetsuo, Imperial Champion is a mythic Legendary Creature — Human Samurai card from Dominaria United Commander (DMC), collector number 44. Current market price: $0.42 (foil $0.55), TCGplayer market prices via Scryfall.
Whenever Tetsuo attacks, if it's equipped, choose one — • Tetsuo deals damage equal to the greatest mana value among Equipment attached to it to any target. • You may cast an instant or sorcery spell from your hand with mana value less than or equal to the greatest mana value among Equipment attached to Tetsuo without paying its mana cost.