
Investigate. If this spell was cast from a graveyard, investigate twice instead. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")
Flashback {3}{U}
Secrets of the Key has 2 printings, first in Innistrad: Midnight Hunt (2021). EDHREC ranks it #13,951 among Commander cards. It appears most in Lonis, Cryptozoologist decks (418 on EDHREC). It has 6 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.