Secrets of the Key

one blue mana Instant

Investigate. If this spell was cast from a graveyard, investigate twice instead. (Create a Clue token. It's an artifact with " two generic mana , Sacrifice this token: Draw a card.")

Flashback three generic mana one blue mana

As Sigarda and Sorin battled, Arlinn and Teferi recovered the key from the Markov catacombs.

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Showing Innistrad: Midnight Hunt#73

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Secrets of the Key rulings

2025-06-06
You 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.
2025-06-06
To 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.
2025-06-06
If 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.
2025-06-06
A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way.
2025-06-06
You can cast a spell using flashback even if it was somehow put into your graveyard without having been cast.
2025-06-06
"Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell 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."

Secrets of the Key keyword rules

Investigate Rule 701.36

“Investigate” means “Create a Clue token.” See rule .

Flashback Rule 702.34

Flashback appears on some instants and sorceries. It represents two static abilities: one that functions while the card is in a player’s graveyard and another that functions while the card is on the stack. “Flashback [cost]” means “You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell 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.” Casting a spell using its flashback ability follows the rules for paying alternative costs in rules and –h.