Let's say I was playing in a 3 way, and I have used mirror mirror on another player already and I am using his deck and I die. So my question is: does the other lose as I, the owner of the cards he is play with, have left play?
800.4a. When a player leaves the game, all objects (see rule 109) owned by that player leave the game, any effects which give that player control of any objects or players end, and all spells and abilities controlled by that player on the stack cease to exist. Then, if there are any objects still controlled by that player, those objects are exiled. This is not a state-based action. It happens as soon as the player leaves the game. If the player who left the game had priority at the time he or she left, priority passes to the next player in turn order who's still in the game.
800.4c If an object that would be owned by a player who has left the game would be created in any zone, it isn't created. If a triggered ability that would be controlled by a player who has left the game would be put onto the stack, it isn't put on the stack.
The answer to {Mirror Mirror} will be in these rulings. Now for someone to explain them :P
I think that answers any and all questions mirror mirror would bring up, thank you