For one thing, its so overwhelmingly red
One thing I really hate facing down in Commander is a combination of cards that makes an opponents battlefield unassailable, usually involving cards like Avacyn, Angel of Hope
That mechanic is a throughline for Magic gods, not FINAL FANTASY ones, and it was a real bummer for Hydaelyn to have a downside when you needed to spend seven mana to flip her
She is forced to mill two cards at the beginning of every turn shes out of the Command zone but that means you have a full Graveyard to pick from
Theres enough cost reduction and free spell-casting in Eternal formats that this might make the cut somewhere, but I wouldnt get too excited about my 3-mana counterspells lining up against Force of Will and friends in Legacy and beyond
Y'shtola's last ability resolves before the spell that caused it to trigger