Cloud Key 
Artifact
$2.13 #613 0.27 19.3 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%
$0.26↓#7512↓0.55↑4.0 years↓
"Spells you cast of the chosen type cost less to cast."
less to cast."
Urza, Lord Protector76%
$10.06↑#5843↓0.50↑3.8 years↓
"Artifact, instant, and sorcery spells you cast cost less to cast."
less to cast."
Planar Gate75%
$77.60↑#21320↓0.68↑32.3 years↑
"Creature spells you cast cost 
less to cast."
less to cast."
Goblin Electromancer74%
$0.21↓#6610.2614.0 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mocking Sprite74%
$0.18↓#2866↓0.16↓3.0 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Mana Matrix74%
$74.48↑#23363↓0.38↑32.3 years↑
"Instant and enchantment spells you cast cost less to cast."
less to cast."
Herald's Horn72%
$1.97↓#150↑0.219.0 years↓
"Creature spells you cast of the chosen type cost less to cast."
less to cast."+1 more matching line
Voyager Quickwelder72%
$0.33↓#2713↓0.09↓1.6 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Foundry Inspector72%
$0.39↓#252↑0.279.9 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Etherium Sculptor72%
$0.82↓#419↑0.2617.9 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Storm Skreelix72%
$0.17↓#18105↓0.184.9 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Enthusiastic Mechanaut72%
$0.29↓#1389↓0.244.5 years↓
"Artifact spells you cast cost less to cast."
less to cast."
Gathering Stone71%
$0.59↓#3375↓0.00↓0.6 years↓
"Spells you cast of the chosen type cost less to cast."
less to cast."+1 more matching line
Honest Rutstein71%
$0.39↓#1787↓0.192.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Arcane Melee71%
$0.35↓#11492↓0.3014.3 years↓
"Instant and sorcery spells cost less to cast."
less to cast."
Urza's Incubator70%
$18.41↑#316↑0.52↑27.2 years↑
"Creature spells of the chosen type cost less to cast."
less to cast."+1 more matching line
Archmage of Runes70%
$3.31↑#954↓0.311.8 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Stormcatch Mentor70%
$0.33↓#943↓0.242.1 years↓
"Instant and sorcery spells you cast cost less to cast."
less to cast."
Heartless Summoning70%
$1.42↓#2793↓0.2514.9 years↓
"Creature spells you cast cost less to cast."
less to cast."