Adaptive Automaton 
Artifact Creature — Construct
$0.43 #1782 0.14 15.3 years
As this creature enters, choose a creature type.
This creature is the chosen type in addition to its other types.
Other creatures you control of the chosen type get +1/+1.
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Cards similar to Adaptive Automaton 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.
Metallic Mimic98%
$0.73↑#947↑0.199.7 years↓
"This creature is the chosen type in addition to its other types."
+2 more matching lines
Rally the Ranks98%
$0.35↓#4714↓0.115.7 years↓
"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Instruments of War98%
$0.37↓#14293↓0.31↑3.9 years↓
"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Shared Triumph96%
$3.98↑#16789↓0.1224.0 years↑
"Creatures of the chosen type get +1/+1."
+1 more matching line
Obelisk of Urd95%
$2.98↑#4090↓0.1812.3 years↓
"Creatures you control of the chosen type get +2/+2."
+1 more matching line
Etchings of the Chosen94%
$0.36↓#3219↓0.107.4 years↓
"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Vanquisher's Banner94%
$2.88↑#384↑0.27↑9.1 years↓
"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Brass Herald94%
$0.23↓#14702↓0.00↓25.4 years↑
"Creatures of the chosen type get +1/+1."
+1 more matching line
An Unexpected Party // At the Door93%
$0.28↓#9369↓0.180.2 years↓
"Creatures you control of the chosen type get +2/+2."
+1 more matching line
Icon of Ancestry92%
$0.40↓#2460↓0.157.3 years↓
"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Patchwork Banner92%
$1.53↑#201↑0.29↑2.2 years↓
"Creatures you control of the chosen type get +1/+1."
+1 more matching line
Door of Destinies90%
$2.42↑#1087↑0.41↑18.8 years↑
"Creatures you control of the chosen type get +1/+1 for each charge counter on this artifact."
+1 more matching line
Tribal Unity90%
$0.40↓#17573↓0.1224.0 years↑
"Creatures of the creature type of your choice get +X/+X until end of turn."
Lifecraft Engine88%
$0.18↓#5771↓0.141.7 years↓
"Each creature you control of the chosen type other than this Vehicle gets +1/+1."
+2 more matching lines
Benalish Marshal88%
$0.45↑#7990↓0.00↓8.5 years↓
"Other creatures you control get +1/+1."
Kongming, "Sleeping Dragon"88%
$0.18↓#18103↓0.1027.5 years↑
"Other creatures you control get +1/+1."
Morophon, the Boundless88%
$7.70↑#15930.67↑7.4 years↓
"Other creatures you control of the chosen type get +1/+1."
+1 more matching line
Anthem of Champions88%
$0.23↓#6246↓0.121.9 years↓
"Creatures you control get +1/+1."
Glorious Anthem88%
$0.37↓#7321↓0.00↓28.0 years↑
"Creatures you control get +1/+1."
Gaea's Anthem88%
$0.23↓#9089↓0.25↑19.7 years↑
"Creatures you control get +1/+1."