Sothera's end step trigger doesn't return a creature if Sothera is no longer on the battlefield
Sothera, the Supervoid's end step trigger to sacrifice itself and put an exiled creature onto the battlefield currently doesn't work if it can't sacrifice itself. If it leaves the battlefield with its trigger on the stack (for example The Mind Stone flickering it or returning it to hand), the trigger does nothing instead of skipping the sacrifice and still putting a creature onto the battlefield like expected. Since there's no "if you do" clause making the rest of the ability depend on sacrificing it, I can't see any reason except a bug that this could be the case.
Tested on Windows version 2026.60.10 against Sparky, ensuring no other effects could interfere with what that trigger is trying to do.
Cheznug#54016
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Tim the Enchanter#77172
commented
I’m not a judge, but when I think through the interaction I can see why you think it should work, but I believe the problem is that when Sothera changes zones, moving it breaks the relationship between Sothera and the cards exiled with it. So at the beginning of your end step it checks to see if a player has no creatures. If all players do it doesn’t trigger. If it does trigger it checks again before resolving. So I think that even with the ability on the stack, doing anything other than sacrificing Sothera won’t return a card because at that point those cards are just plain exiled, not exiled _with Sothera_ when the ability tries to resolve.