Arcane Adaptation 
Enchantment
$3.05 #3990 0.25 8.9 years
As this enchantment enters, choose a creature type.
Creatures you control are the chosen type in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.
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Cards similar to Arcane Adaptation 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.
Conspiracy100%
$0.39↓#5345↓0.41↑26.9 years↑
"Creatures you control are the chosen type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
+1 more matching line
Leyline of Transformation98%
$0.52↓#35440.271.9 years↓
"Creatures you control are the chosen type in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
+1 more matching line
Maskwood Nexus94%
$1.47↓#490↑0.37↑5.6 years↓
"Creatures you control are every creature type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
Rukarumel, Biologist89%
$1.98↓#10665↓0.333.1 years↓
"Slivers you control and nontoken creatures you control are the chosen type in addition to their other creature types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
+1 more matching line
Biotransference89%
$9.61↑#42580.43↑3.9 years↓
"Creatures you control are artifacts in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
Xenograft88%
$0.94↓#14289↓0.40↑15.3 years↑
"Each creature you control is the chosen type in addition to its other types."
+1 more matching line
Roshan, Hidden Magister84%
$0.23↓#6880↓0.09↓2.2 years↓
"Other creatures you control are Assassins in addition to their other types. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."
Ashes of the Fallen81%
$7.77↑#13909↓0.2521.3 years↑
"Each creature card in your graveyard has the chosen creature type in addition to its other types."
+1 more matching line
Mistform Wakecaster76%
$0.11↓#30150↓0.00↓23.6 years↑
", 
: Choose a creature type. Each creature you control becomes that type until end of turn."
, : Choose a creature type. Each creature you control becomes that type until end of turn."+1 more matching line
Hivestone72%
$0.47↓#16828↓0.59↑19.9 years↑
"Creatures you control are Slivers in addition to their other creature types."
Lifecraft Engine72%
$0.23↓#5902↓0.261.6 years↓
"Vehicle creatures you control are the chosen creature type in addition to their other types."
+1 more matching line
Realmwright70%
$0.28↓#18664↓0.14↓13.6 years↑
"Lands you control are the chosen type in addition to their other types."
+1 more matching line
Kudo, King Among Bears70%
$0.33↓#6582↓0.55↑2.2 years↓
"Other creatures have base power and toughness 2/2 and are Bears in addition to their other types."