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.
「钥匙只能打开门锁。持钥人还须决定是否要亲自跨过门槛。」
～*《河鼓形上学论》，卷II*于云钥进战场时，选择神器，生物，结界，瞬间或法术。
你施放的该类别咒语减少来施放。
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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