If player A has a creature, and then on player B's turn, he/she uses Act of Treason on it, and then Cloudshift, does that card, once it has been cloudshift-ed, return to the battlefield under the control of player B, and thus, not return to A after B's turn has finished?
My thinking is that the card will be under player B's control until the end of the game/ or until the creature in question has been put into the graveyard or removed from play - because, Act of Treason states that you 'gain control of target creature until the end of turn' but cloudshift states that you 'exile target creature you control, then return that card to the battlefield under your control.'.
Any thoughts? Can this be done?