Target player shuffles up to two target cards from their graveyard into their library.
Flashback


(You may cast this card from your graveyard for its flashback cost. Then exile it.)
"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."