Mothers Yamazaki is a rare Legendary Creature — Human Samurai card from Mystery Booster 2 (MB2), collector number 598. Current market price: $0.22, TCGplayer market prices via Scryfall.
Partner with itself (When this enters, target player may put Mothers Yamazaki into their hand from their library, then shuffle. A Commander deck can include two of this card, and they can be your commanders.) As long as you control exactly two permanents named Mothers Yamazaki, the "legend rule" doesn't apply to them, and Samurai you control get +2/+2 and have vigilance and haste.