Quicken
Instant
The next sorcery spell you cast this turn can be cast as though it had flash. (It can be cast any time you could cast an instant.)
Draw a card.
A skilled Izzet chronarch can carry out an epic vendetta between the fall of one hourglass grain and the next.
Aleksi Briclot
Ravnica Remastered (RVR)
• #57Rulings
After Quicken resolves, you can Suspend a sorcery in your hand any time you can cast an instant. As soon as you actually cast a sorcery, you lose this capability.
(wotc • 2006-09-25)
You don't choose a sorcery card when Quicken resolves. Rather, this sets up a rule that is true for you until the turn ends or until you cast a sorcery card, even if you cast that sorcery at a time you normally could.
(wotc • 2006-02-01)
If you cast multiple Quickens on the same turn, they'll all apply to the very next sorcery spell you cast.
(wotc • 2006-02-01)
Rulings
After Quicken resolves, you can Suspend a sorcery in your hand any time you can cast an instant. As soon as you actually cast a sorcery, you lose this capability.
(wotc • 2006-09-25)
You don't choose a sorcery card when Quicken resolves. Rather, this sets up a rule that is true for you until the turn ends or until you cast a sorcery card, even if you cast that sorcery at a time you normally could.
(wotc • 2006-02-01)
If you cast multiple Quickens on the same turn, they'll all apply to the very next sorcery spell you cast.
(wotc • 2006-02-01)