Sakashima of a Thousand Faces is a mythic Legendary Creature — Human Rogue card from Commander Legends (CMR), collector number 89. Current market price: $31.95 (foil $41.52), TCGplayer market prices via Scryfall.
You may have Sakashima enter as a copy of another creature you control, except it has Sakashima's other abilities. The "legend rule" doesn't apply to permanents you control. Partner (You can have two commanders if both have partner.)