Feather, the Redeemed bug with Emrakul, the Promised End
Recently came across what seemed to be a bug during a game. Opponent had Feather in play, I cast Emrakul. In response, opponent casts instants, they resolve, and enter exile. At the end of the opponents turn that I control, I put a stop. Instants return to hand. I meant to cast them during end step so they aren't available until the opponent's next end step, but no cards at all are castable. Opponent's instants are mostly targeted spells, which Emrakul has protection from but I have other creatures that can be targeted.
-
Rezzahan#77802 commented
If you cast Emrakul and your opponent responded with his instants, then those instants will return to hand in the end step of YOUR current turn. A time when you do not yet control your opponent.