Conflagrate | Magic: The Gathering
Formats Conflagrate is Legal in
Official Oracle Text for Conflagrate
Flashback—, Discard X cards. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Official Rulings for Conflagrate
9/25/2006 : While Conflagrate is on the stack, its mana cost will reflect the value chosen for X, even if it was cast with flashback and no mana was spent on X.