This is a similar question, but a slightly different situation, so no duplicate: What happens if I have two Pledges of Loyalty attached to a creature?
Now to my scenario:
Let's say I have two Grizzly Bears with one Pledge of Loyalty attached to each of them. Now my opponent casts e.g. Back to Nature, killing both of my Pledges. I would like to keep my Bears protected, so I cast Second Sunrise during the end step. Note that no other cards were put into any graveyard this turn, so it would revive only the two Pledges. While it is on the stack, my opponent decides to bounce one of my Grizzly Bears with a blue instant of your choice.
Now, the Sunrise resolves, I have to put my Pledges back and since the remaining Grizzlies are the only creature, both have to enchant it as per rule 303.4f. Now, I would think that they would enter the battlefield simultaneously, so no Pledge will be there "first" and prevent the other from attaching.
Is that correct so far? What will happen afterwards? Will both Pledges be put into my graveyard again? Will one of them, or even both, survive?