Quicken allows me to cast a sorcery "any time I could cast an instant", but I don't want my opponents to know I am planning to do that, is the following legal?:
- The player before me pass the turn
- I respond casting quicken in the end step
- No one respondes so Quicken resolve
- I now cast my sorcery, still in his end step
Is the fourth step valid? Do I get the priority again after Quicken resolves but before my turn starts to cast my sorcery at instant speed?