so if i have a hive mind on the field and i cast glorious end after my end step, just what happens?
It doesn’t matter when in your turn you cast it. The turn ends all the same.
When you cast Glorious End on your turn, Hive Mind triggers and your opponent copies Glorious End. That copy of Glorious End goes on the stack above the original Glorious End. When the copy of Glorious End resolves, it ends the turn, exiling the original Glorious End from the stack, and sets up the delayed “lose the game” trigger for your opponent.
After the cleanup step, the game then proceeds to your opponent’s turn. At the beginning of their end step, the delayed trigger from Glorious End will go on the stack and they’ll lose the game unless they can can do something about the trigger.
