Morophon, the Boundless 
Legendary Creature — Shapeshifter
$7.70 #1593 0.67 7.4 years
Changeling (This card is every creature type.)
As Morophon enters, choose a creature type.
Spells of the chosen type you cast cost 
less to cast. This effect reduces only the amount of colored mana you pay.
less to cast. This effect reduces only the amount of colored mana you pay.Other creatures you control of the chosen type get +1/+1.
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Cards similar to Morophon, the Boundless 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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"As this enchantment enters, choose a creature type."
+1 more matching line
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"Other creatures you control of the chosen type get +1/+1."
+2 more matching lines
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"As this enchantment enters, choose a creature type."
+1 more matching line
Instruments of War87%
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"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Door of Destinies86%
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"As this artifact enters, choose a creature type."
+1 more matching line
Universal Automaton86%
$0.61↓#2150↓0.12↓7.4 years
"Changeling"
Chitinous Graspling86%
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Gangly Stompling86%
$0.19↓#15199↓0.17↓0.7 years↓
"Changeling"
Mischievous Sneakling86%
$0.21↓#13391↓0.07↓0.7 years↓
"Changeling"
Venomous Changeling86%
$0.18↓#10804↓0.06↓7.4 years
"Changeling"
Impostor of the Sixth Pride86%
$0.18↓#10090↓0.00↓7.4 years
"Changeling"
Metallic Mimic86%
$0.73↓#947↑0.19↓9.7 years↑
"As this creature enters, choose a creature type."
+2 more matching lines
Radiant Destiny86%
$0.30↓#5650↓0.00↓8.8 years↑
"As this enchantment enters, choose a creature type."
+1 more matching line
Realmwalker85%
$2.05↓#612↑0.20↓5.7 years↓
"As this creature enters, choose a creature type."
+1 more matching line
Prideful Feastling84%
$0.17↓#17002↓0.01↓0.7 years↓
"Changeling"
Obelisk of Urd84%
$2.98↓#4090↓0.18↓12.3 years↑
"Creatures you control of the chosen type get +2/+2."
+1 more matching line
Guardian Gladewalker84%
$0.09↓#8358↓0.00↓5.7 years↓
"Changeling"
Brass Herald83%
$0.23↓#14702↓0.00↓25.4 years↑
"As this creature enters, choose a creature type."
+1 more matching line
Irregular Cohort83%
$0.19↓#5519↓0.07↓7.4 years
"Changeling"