Is it possible to cast a card twice, first with Flashback AND then with Kess, Dissident Mage "play from graveyard" ability or vice versa?
Flashback says - You may play this card from your graveyard for the Flashback cost. Then remove it from the game.
Kess say - you may cast instance or sorcery card from your graveyard. If it would go into the graveyard, exile it instead.