Artwork unavailableEnglish Oracle text
As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost 
less to cast.
它转动所发出的乐音，能触动启示的机栓。于云钥进场时，选择神器，生物，结界，瞬间，或法术。
你使用的该类别咒语费用减少来使用。
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of Cloud Key's ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
The cost reduction applies only to generic mana in the cost of spells of the chosen type you cast.
Legality follows the dated Scryfall catalog snapshot.
For draft and prerelease, check the event’s release and rules. Missing statuses stay unavailable.
Official Magic rules| Format | Status |
|---|---|
| Standard | Not legal |
| Pioneer | Not legal |
| Modern | Legal |
| Legacy | Legal |
| Vintage | Legal |
| Commander | Legal |
| Oathbreaker | Legal |
| Alchemy | Not legal |
| Historic | Legal |
| Brawl | Legal |
| Comp. Brawl | Legal |
| Timeless | Legal |
| Pauper | Not legal |
| Duel | Legal |
For draft and prerelease, check the event’s release and rules.
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