Flashback

Flashback is a keyword ability on instants and sorceries that allows the player to pay an alternative cost to cast the spell directly from their graveyard. The spell card is exiled when the spell leaves the stack. Flashback's equivalent for permanents is unearth.

History
The first tournament-legal cards with flashback were printed in Odyssey block, but the mechanic returned in both the Time Spiral block and the Innistrad block. It also appeared in Modern Horizons, Commander 2019 and Modern Horizons 2.

Rulings

 * You must still follow any timing restrictions, including those based on the card's type. You can only cast a sorcery using flashback when you could normally cast a sorcery. Likewise, when an instant (with flashback) is sent to the graveyard, that player may cast it from the graveyard once more during their opponent's turn.
 * Casting a spell using flashback doesn't change the mana cost (or converted mana cost) of the spell. You just pay the flashback cost instead.
 * Effects that cause you to pay more or less when casting a spell will also affect what you pay when casting the spell using flashback.
 * A spell cast using flashback will always be exiled afterward, whether it resolves, it's countered, or it leaves the stack in some other way.

Artifact that alters flashback costs

 * Catalyst Stone

Cards that grant flashback

 * Creatures
 * Backdraft Hellkite
 * Dralnu, Lich Lord
 * Snapcaster Mage
 * Sorceries
 * Past in Flames
 * Recoup
 * Plane
 * Otaria