If you have a Sundial of the Infinite on the battlefield, you can cast Glorious End whenever you want and then go about your turn as normal as long as you end your turn before going to your end-of-turn phase

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Generation I starter with permanent legacy status One of the three Base Set starter holofoils that founded the modern TCG Mega Venusaur's Smogon OU competitive history in Gen VI Tree-canopy Mega design as a memorable Mega Evolution Cross-generational cultural recognition Generation I starter in Pokemon Red/Green/Blue (1996-1998) Multiple anime arcs including Ash's Bulbasaur evolution arc Pokemon Stadium / Stadium 2 prominent feature Mega Venusaur in Pokemon X/Y (2013) and OR/AS (2014) Pokemon GO release in 2016 with subsequent Mega Venusaur event Venusaur has held viable competitive presence across multiple generations
Sundial of the Infinites activated ability skips straight to the cleanup step, exiling whatevers on the stack, removing all creatures from combat, and otherwise disrupting normal gameplay
The less pressure you need to use, the more control you have over the cut you make