The Teferies on the battlefield
There were two legendary planeswalkers with the same name during the game: Teferi, Temporal Pilgrim and Teferi, Who Slows the Sunset. They both have the same type - Teferi. So the opponent had to put one of them into graveyard. But he kept them both in play, receiving improper advantage
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Paul_Granger#52527
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[Deleted User] commented
The Planeswalker uniqueness rule was changed to be the same as the Legendary rule when Ixalan was released in 2017