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

„Ein Schlüssel schließt eine Tür auf. Sein Träger muss sich entscheiden, ob er die Schwelle überschreiten will."
—*Hurkyls Metaphysik, Band II*

Wolkenschlüssel

Sowie der Wolkenschlüssel ins Spiel kommt, bestimme Artefakt, Kreatur, Verzauberung, Spontanzauber oder Hexerei.
Zaubersprüche des bestimmten Typs, die du wirkst, kosten beim Wirken {1} weniger.

"Una llave solo abre una puerta. Quien la use debe decidir si quiere atravesar el umbral".
—*Meditaciones metafísicas de Hurkyl, Vol. II*

Llave de nubes

En cuanto la Llave de nubes entre al campo de batalla, elige entre artefacto, criatura, encantamiento, instantáneo o conjuro.
Te cuesta {1} menos lanzar hechizos del tipo elegido.

« Une clef ne peut que déverrouiller une porte. C'est à la personne qui l'utilise de choisir si elle franchit le seuil. »
—*Études métaphysiques d'Hurkyl, vol. II*

Clef de nuage

Au moment où la Clef de nuage arrive sur le champ de bataille, choisissez artefact, créature, enchantement, éphémère ou rituel.
Les sorts du type choisi que vous lancez coûtent {1} de moins à lancer.

"Una chiave apre solo una porta. Chi la impugna deve scegliere se attraversare la soglia."
—*Metafisica di Hurkyl, vol. II*

Chiave delle Nuvole

Mentre la Chiave delle Nuvole entra nel campo di battaglia, scegli artefatto, creatura, incantesimo, istantaneo oppure stregoneria.
Le magie che lanci del tipo scelto costano {1} in meno per essere lanciate.

「鍵は扉を開くだけにすぎない。手にしたものは、敷居を跨ぐかどうかを選択しなければならない。」
――*「ハーキルの形而上学、第二巻」*

雲の鍵

雲の鍵が戦場に出るに際し、アーティファクトかインスタントかエンチャントかクリーチャーかソーサリーを選ぶ。
あなたがその選ばれたタイプの呪文を唱えるためのコストは{1}少なくなる。

"Uma chave apenas abre uma porta. Quem a usa precisa escolher atravessar esse limiar."
— *Metafísica de Hurkyl, vol. II*

Abre-nuvem

Conforme Abre-nuvem entra no campo de batalha, escolha artefato, criatura, encantamento, mágica instantânea ou feitiço.
As mágicas que você conjura do tipo escolhido custam {1} a menos para serem conjuradas.

「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*

云钥

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{1}来施放。

Cloud Key

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

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

The Brothers' War Retro Artifacts

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.

The List

Time Spiral Remastered

The cost reduction applies only to generic mana in the cost of spells of the chosen type you cast.

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.