Sphinx of Forgotten Lore
Creature — Sphinx
Oracle Text
Flash (You may cast this spell any time you could cast an instant.) Flying Whenever this creature attacks, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to that card's mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)Rules for this card
Rulings (6)
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Wizards of the CoastYou can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
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Wizards of the CoastYou must still follow any timing restrictions and permissions, including those based on the card's type. For instance, you can cast a sorcery using flashback only when you could normally cast a sorcery.
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Wizards of the CoastA spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
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Wizards of the Coast"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."
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Wizards of the CoastTo determine the total cost of a spell, start with the mana cost or alternative cost (such as a flashback cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
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Wizards of the CoastIf a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions.