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| Set: | The Brothers' War Retro Artifacts |
| Type: | Artifact |
| Rarity: | Rare |
| Cost: | {3} |
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.
Spells you cast of the chosen type cost {1} less to cast.
The musical sound of its turning triggers the tumblers of revelation.