Mocking Doppelganger is a rare Creature — Shapeshifter card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 667. Current market price: $4.31, TCGplayer market prices via Scryfall.
Flash You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded." (They attack each combat if able and attack a player other than you if able.)
All Commander Legends: Battle for Baldur's Gate cards and prices