Metallic Mimic 
Artifact Creature — Shapeshifter
$0.73 #947 0.19 9.7 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.
Adaptive Automaton98%
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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%
$2.42↑#10870.41↑18.8 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%
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"As this artifact enters, choose a creature type."
+1 more matching line
Etchings of the Chosen92%
$0.36↓#3219↓0.107.4 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
An Unexpected Party // At the Door90%
$0.28↓#9369↓0.180.2 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
Vanquisher's Banner90%
$2.88↑#384↑0.279.1 years
"As this artifact enters, choose a creature type."
+1 more matching line
Lifecraft Engine90%
$0.18↓#5771↓0.141.7 years↓
"As this Vehicle enters, choose a creature type."
+2 more matching lines
Patchwork Banner88%
$1.53↑#201↑0.292.2 years↓
"As this artifact enters, choose a creature type."
+1 more matching line
Icon of Ancestry88%
$0.40↓#2460↓0.157.3 years↓
"As this artifact enters, choose a creature type."
+1 more matching line
Morophon, the Boundless86%
$7.70↑#1593↓0.67↑7.4 years↓
"As this card enters, choose a creature type."
+1 more matching line
Chronicle of Victory86%
$21.94↑#1444↓0.53↑0.7 years↓
"As this card enters, choose a creature type."
Roaming Throne82%
$47.92↑#133↑1.60↑2.9 years↓
"This creature is the chosen type in addition to its other types."
+2 more matching lines
Renewed Solidarity81%
$3.71↑#1686↓0.38↑1.7 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
Belbe's Portal81%
$1.15↑#12745↓0.47↑26.7 years↑
"As this artifact enters, choose a creature type."
Banner of Kinship80%
$6.83↑#614↑0.40↑1.9 years↓
"As this artifact enters, choose a creature type. This artifact enters with a fellowship counter on it for each creature you control of the chosen type."