
You may have Sakashima the Impostor enter as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, it's legendary in addition to its other types, and it has "{2}{U}{U}: Return Sakashima the Impostor to its owner's hand at the beginning of the next end step."
Sakashima the Impostor has 4 printings, first in Saviors of Kamigawa (2005). EDHREC ranks it #2,042 among Commander cards. It appears most in Sisay, Weatherlight Captain decks (3,648 on EDHREC). 1 public deck on TCG runs it. It has 3 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.