Your search for "mocking doppelganger 667" revealed the following:
Mocking Doppelganger (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Igor Grechanyi Card Text:FlashYou may have Mocking Doppelganger enter the battlefield as a copy of a creature an opponent controls,...
Mocking Doppelganger - Extended Art (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Igor Grechanyi Card Text:FlashYou may have Mocking Doppelganger enter the battlefield as a copy of a creature...
Mocking Doppelganger // Mocking Doppelganger - Art Series (Gold-Stamped Signature) (ACLB) from Battle for Baldur's Gate Art Series, available at 401 Games Canada. Rarity: Common Finish: Normal Card Text:Medium monstrosity (shapechanger), Challenge 3Armor Class 14, Hit Points 52Speed 30 ft.Attacks...