Katilda and Lier is a mythic Legendary Creature — Human card from March of the Machine Commander (MOC), collector number 446. Current market price: $0.38 (foil $0.49), TCGplayer market prices via Scryfall.
Whenever you cast a Human spell, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)