Hi,
If I use Mystic Reflection, then, later, a Mass blink effect, like Yorion, Sky Nomad:
Should all permanents enter at the same time, hence everyone of them becomes a copy.
Or Do they enter as a precise order, hence only one of them become a copy.
The cards exiled with Yorion are returned to the battlefield at the same time (C.R. 608.2f). Thus, all of them that enter as creatures and/or planeswalkers become copies of the creature targeted with Mystic Reflection (and this will still happen even if the targeted creature has left the battlefield in the meantime, in which case the creature's last known information is taken into account [C.R. 608.2h]). Compare Yorion with Lifeline, which returns one card it refers to to the battlefield at a time, even if two or more of them were sent to the graveyard at the same time. Also compare Yorion with Skybind.
If I use Mystic Reflection, then, later, a Mass blink effect, like Yorion, Sky Nomad:
Should all permanents enter at the same time, hence everyone of them becomes a copy.
Or Do they enter as a precise order, hence only one of them become a copy.