If Magics favorite eldritch monstrosities do make a return, then cards that can help power them out will have a real shot in Standard
What I can do is estimate what happens to the format next
As long as they were nonland permanents when they entered, they entered under your control, and there were at least two of them, celebration abilities will be happy
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Buy This Card Notes and Rules Information for Dream Devourer: It doesnt matter if Dream Devourer is still on the battlefield or still under your control as you cast the spell from exile
If any permanent has an ability that triggers when the permanent you return leaves the battlefield, that ability will be put on the stack after you finish casting the spell, and it will resolve before that spell
This allows us to call back to multiple things at once