The musical sound of its turning triggers the tumblers of revelation.

The Brothers' War Retro Artifacts

Cloud Key

As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost {1} less to cast.

As Cloud Key enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost {1} less to cast.

"A key only unlocks a door. Its wielder must choose whether to cross the threshold."
—*Hurkyl's Metaphysics, vol. II*

The List

Time Spiral Remastered

Future Sight

As Cloud Key comes into play, choose artifact, creature, enchantment, instant, or sorcery.
Spells you play of the chosen type cost {1} less to play.