Secrets of the Key - Innistrad: Double Feature (Common) [DBL-73]

Secrets of the Key is a blue instant from Innistrad: Double Feature that lets you investigate, creating a Clue token for card draw. If you cast it from your graveyard, you investigate twice, providing additional card advantage. Its Flashback ability makes it a valuable option in decks that focus on graveyard recursion and card draw strategies. Available from Vault of Cards, a UK-based Magic: The Gathering store with fast delivery.