Buyback

Buyback is a keyword ability that appears on instants and sorceries. It provides an optional additional cost that the player casting the spell with buyback may pay as they cast it. If the player does, as the spell finishes resolving, the spell card is put back into its owner's hand rather than into their graveyard.

Description
The first tournament-legal cards with buyback were printed during Tempest block. One card, Capsize, was later reprinted as a Friday Night Magic promo in 2003. Several years later, a number of cards with buyback were printed in Time Spiral, along with a Timeshifted reprint of Whispers of the Muse. It also appeared in Modern Horizons.

An experimental test card in the Mystery Booster set, Innocuous Insect, is the first creature to feature Buyback.

Rulings

 * Buyback is an additional cost. You choose whether to pay the buyback cost at the time you cast the spell. If you choose to do so, then after the spell's effect happens, the spell will be returned to your hand instead of being put into your graveyard.
 * Buyback returns the spell to your hand only if the spell resolves. If the spell is countered, it goes to the graveyard as normal.
 * If you control a copy of a spell whose buyback cost was paid, the copy will be put into your hand as it resolves, then it will cease to exist.
 * Whether the spell is returned to your hand depends on whether the choice to pay buyback was made, not on the actual payment of buyback (in the unusual cases where cost-reduction effects mean the buyback cost isn't actually paid).
 * Buyback costs don't count toward a spell's mana cost or converted mana cost, whether they're paid or not.
 * If a spell with buyback somehow gains flashback (such as with Snapcaster Mage's ability), the buyback cost may be paid, but the card will still be exiled as it resolves due to flashback's replacement effect exiling it regardless of whether flashback or buyback is applied first.

Artifact that reduces Buyback costs

 * Memory Crystal