Magosi, the Waterveil [Zendikar] Giant Wizard you may cast the copy

you may cast the copy without paying its mana cost

but knowledge is a skeleton key

Set: Scars of Mirrodin Type: Artifact Rarity: Rare Cost: {3} Imprint — When Semblance Anvil enters the battlefield

Venand Kapur—known as the Gearherder—built this automaton to keep watch over his clockwork herds

Magosi, the Waterveil [Zendikar] Giant Wizard you may cast the copySet: Zendikar Type: Land Rarity: Rare Magosi, the Waterveil enters the battlefield tapped. {T}: Add {U}. {U}, {T}: Put an eon counter on Magosi, the Waterveil. Skip your next turn. {T}, Remove an eon counter from Magosi, the Waterveil and return it to its owner's hand: Take an extra turn after this one.