Cloud Key 
Artifact
$1.80 #606 0.27 19.5 years
As this artifact enters, choose artifact, creature, enchantment, instant, or sorcery.
Spells you cast of the chosen type cost 
less to cast.
less to cast.Click a line or tag to filter
Cards similar to Cloud Key expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Stenn, Paranoid Partisan87%
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"Spells you cast of the chosen type cost less to cast."
less to cast."
Urza, Lord Protector76%
$9.03↑#5931↓0.11↓3.9 years↓
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Planar Gate75%
$74.69↑#21434↓0.38↑32.4 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Goblin Electromancer74%
$0.21↓#6730.2314.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mocking Sprite74%
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"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mana Matrix74%
$75.59↑#23674↓0.10↓32.4 years↑
"Instant and enchantment spells you cast cost less to cast."
less to cast."
Herald's Horn72%
$2.80↑#151↑0.249.2 years↓
"Creature spells you cast of the chosen type cost less to cast."
less to cast."+1 more matching line
Etherium Sculptor72%
$0.36↓#414↑0.2618.0 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Voyager Quickwelder72%
$0.29↓#2584↓0.09↓1.7 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Foundry Inspector72%
$0.30↓#249↑0.2610.1 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Enthusiastic Mechanaut72%
$0.31↓#1365↓0.244.7 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Gathering Stone71%
$0.44↓#3079↓0.10↓0.7 years↓
"Spells you cast of the chosen type cost less to cast."
less to cast."+1 more matching line
Honest Rutstein71%
$0.38↓#1855↓0.16↓2.5 years↓
"Creature spells you cast cost less to cast."
less to cast."
Arcane Melee71%
$0.37↓#11690↓0.3214.5 years↓
"Instant and sorcery spells cost less to cast."
less to cast."
Urza's Incubator70%
$20.34↑#311↑0.62↑27.4 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."+1 more matching line
Stormcatch Mentor70%
$0.33↓#949↓0.292.2 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Archmage of Runes70%
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"Instant and sorcery spells you cast cost less to cast."
less to cast."
Heartless Summoning70%
$1.63↓#2677↓0.3715.1 years↓
"Creature spells you cast cost less to cast."
less to cast."