Urza's Incubator 
Artifact
$18.41 #316 0.52 27.2 years
As this artifact enters, choose a creature type.
Creature spells of the chosen type cost 
less to cast.
less to cast.Click a line or tag to filter
Cards similar to Urza's Incubator 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.
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"Creature spells you cast of the chosen type cost 
less to cast."
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"As this enchantment enters, choose a creature type."
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"Creature spells you cast that share a creature type with this creature cost less to cast."
less to cast."+1 more matching line
From the Rubble84%
$0.29↓#8803↓0.40↓2.8 years↓
"As this enchantment enters, choose a creature type."
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"As this artifact enters, choose a creature type."
Instruments of War84%
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"As this artifact enters, choose a creature type."
Brass Herald83%
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"As this creature enters, choose a creature type."
+1 more matching line
Honest Rutstein82%
$0.39↓#1787↓0.19↓2.4 years↓
"Creature spells you cast cost less to cast."
less to cast."
Mirror of the Forebears82%
$1.63↓#10360↓0.539.0 years↓
"As this artifact enters, choose a creature type."
Door of Destinies82%
$2.62↓#1076↓0.4718.6 years↓
"As this artifact enters, choose a creature type."
Rally the Ranks82%
$0.36↓#4621↓0.14↓5.6 years↓
"As this enchantment enters, choose a creature type."
Vanquisher's Banner82%
$5.20↓#3720.26↓8.9 years↓
"As this artifact enters, choose a creature type."
Adaptive Automaton82%
$0.43↓#1759↓0.15↓15.1 years↓
"As this creature enters, choose a creature type."
Pillar of Origins81%
$0.45↓#5907↓0.17↓8.9 years↓
"As this artifact enters, choose a creature type."
Obelisk of Urd81%
$2.73↓#4019↓0.21↓12.1 years↓
"As this artifact enters, choose a creature type."
Marauding Raptor80%
$0.91↓#3000↓0.18↓7.2 years↓
"Creature spells you cast cost less to cast."
less to cast."
Heartless Summoning80%
$1.42↓#2793↓0.25↓14.9 years↓
"Creature spells you cast cost less to cast."
less to cast."
Radiant Destiny80%
$0.34↓#5541↓0.09↓8.6 years↓
"As this enchantment enters, choose a creature type."
Gathering Stone80%
$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