Morophon, the Boundless 
Legendary Creature — Shapeshifter
$8.27 #1558 0.67 7.2 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."
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"Creatures you control of the chosen type get +1/+1."
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"Changeling"
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"Changeling"
Gangly Stompling86%
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"As this creature enters, choose a creature type."
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"As this enchantment enters, choose a creature type."
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"As this creature enters, choose a creature type."
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"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Guardian Gladewalker84%
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"As this card enters, choose a creature type."
+1 more matching line