Xyz Double Back (CBLZ-EN056) [Cosmo Blazer]

During the turn a face-up Xyz Monster you control was destroyed, if you control no monsters: Target 1 Xyz Monster in your Graveyard that was destroyed this turn and 1 monster in your Graveyard with ATK less than or equal to that Xyz Monster's; Special Summon these targets, but they are destroyed during the End Phase.