Snapcaster Sage

Flash
When Snapcaster Sage enters the battlefield, counter target instant or sorcery spell. Then, the caster of the spell discards cards from his or her hand equal to the spell's converted
mana cost.
As long as Snapcaster Sage remains on the battlefield, all instant and sorcery cards in your graveyard have flashback. (Their flashback costs are equal to their mana cost)