Quicken

Oracle Text

The next sorcery card 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.

Card Rulings

2/1/2006 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.
2/1/2006 If you cast multiple Quickens on the same turn, they’ll all apply to the very next sorcery spell you cast.
9/25/2006 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.
7/1/2013 Casting a copy of a sorcery card won’t “use up” Quicken’s effect because the copy isn’t a card.