Flashback



Flashback is a static ability that appears on some instant and sorcery cards. A spell with flashback may be cast from your graveyard for an alternate cost at any time you could normally cast the spell. If a card is spelt this way it is exiled as the spell resolves.

Example
Aaron has an Artful Dodge in his graveyard. At any point he could normally cast Artful Dodge, he can pay to cast it.

Comprehensive Rules
702.33. Flashback


 * 702.33a. Flashback appears on some instants and sorceries. It represents two static abilities: one that functions while the card is in a player's graveyard and another that functions while the card is on the stack. "Flashback [cost]" means "You may cast this card from your graveyard by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack."