Yorion caused Realmbreaker's Grasp to bounce and returned to the battlefield
This was a couple weeks ago and I was directed to post the bug here from customer support.
During a limited match I played Yorion to flicker my board. One of those permanents flickered was a creature that had Realmbreaker's Grasp attached to it. When everything returned to the battlefield, Realmbreaker's Grasp returned to the battlefield and attached itself to an incubate token that was made when my Sculpted Perfection etb triggered.
Realmbreaker's Grasp should have have returned to the battlefield, my opponent got no trigger to choose where it went, it just attached to a token. I almost lost the game when I was unable to transform said token
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Krata#01419 commented
It's an aura though, it targets a creature as it's cast. That's my understanding from the rules.
303.4a An Aura spell requires a target, which is defined by its enchant ability.
303.4b The object or player an Aura is attached to is called enchanted. The Aura is attached to, or “enchants,” that object or player.
303.4c If an Aura is enchanting an illegal object or player as defined by its enchant ability and other applicable effects, the object it was attached to no longer exists, or the player it was attached to has left the game, the Aura is put into its owner’s graveyard. (This is a state-based action. See rule 704.) -
[Deleted User] commented
The token was the only possible choice to attach the aura to. As it reenters the battlefield along all the other cards, those cards are not eligible to attach it to. The player has to choose among what is already on the field.