Metallic Mimic 
Artifact Creature — Shapeshifter
$1.34 #985 0.15 9.6 years
As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
Each other creature you control of the chosen type enters with an additional +1/+1 counter on it.
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Cards similar to Metallic Mimic 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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"This creature is the chosen type in addition to its other types."
+2 more matching lines
Rally the Ranks98%
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"As this enchantment enters, choose a creature type."
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Shared Triumph96%
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"As this enchantment enters, choose a creature type."
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Radiant Destiny96%
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"As this enchantment enters, choose a creature type."
Instruments of War95%
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"As this artifact enters, choose a creature type."
+1 more matching line
Door of Destinies94%
$2.62↑#10760.47↑18.6 years↑
"As this artifact enters, choose a creature type."
+1 more matching line
Vanquisher's Banner94%
$5.20↑#372↑0.26↑8.9 years
"As this artifact enters, choose a creature type."
+1 more matching line
Brass Herald93%
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"As this creature enters, choose a creature type."
+1 more matching line
Obelisk of Urd92%
$2.73↑#4019↓0.2112.1 years↑
"As this artifact enters, choose a creature type."
+1 more matching line
Etchings of the Chosen91%
$0.33↓#3116↓0.167.2 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
An Unexpected Party // At the Door90%
$0.40↓#11814↓0.00↓0.1 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
Chronicle of Victory90%
$20.80↑#1610↓0.00↓0.6 years↓
"As this card enters, choose a creature type."
Lifecraft Engine90%
$0.23↓#5902↓0.26↑1.6 years↓
"As this Vehicle enters, choose a creature type."
+2 more matching lines
Patchwork Banner88%
$2.58↑#199↑0.50↑2.1 years↓
"As this artifact enters, choose a creature type."
+1 more matching line
Icon of Ancestry88%
$0.40↓#2384↓0.197.2 years↓
"As this artifact enters, choose a creature type."
+1 more matching line
Morophon, the Boundless86%
$8.27↑#1558↓0.67↑7.2 years↓
"As this card enters, choose a creature type."
+1 more matching line
From the Rubble85%
$0.29↓#8803↓0.40↑2.8 years↓
"As this enchantment enters, choose a creature type."
Roaming Throne82%
$46.38↑#132↑1.45↑2.8 years↓
"This creature is the chosen type in addition to its other types."
+2 more matching lines
Renewed Solidarity82%
$4.58↑#1764↓0.33↑1.6 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
Belbe's Portal81%
$1.09↓#12558↓0.37↑26.6 years↑
"As this artifact enters, choose a creature type."