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.

Legalities

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Rulings (3)

2006-02-01 If you cast multiple Quickens on the same turn, they'll all apply to the very next sorcery spell you cast.
2006-02-01 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.
2006-09-25 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.