Biotransference 
Enchantment
$9.61 #4258 0.43 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.
Whenever you cast an artifact spell, you lose 1 life and create a 2/2 black Necron Warrior artifact creature token.
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Cards similar to Biotransference 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.
Arcane Adaptation89%
$3.05↓#39900.25↓8.9 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."
Conspiracy88%
$0.39↓#5345↓0.4126.9 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."
Leyline of Transformation86%
$0.52↓#35440.27↓1.9 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."
Encroaching Mycosynth86%
$0.46↓#39790.373.6 years
"Nonland permanents you control are artifacts in addition to their other types. The same is true for permanent spells you control and nonland permanent cards you own that aren't on the battlefield."
Maskwood Nexus83%
$1.47↓#490↑0.375.6 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."
Myrsmith81%
$0.14↓#7878↓0.06↓15.9 years↑
"Whenever you cast an artifact spell, you may pay 
. If you do, create a 1/1 colorless Myr artifact creature token."
. If you do, create a 1/1 colorless Myr artifact creature token."
Efficient Construction78%
$0.45↓#2631↑0.26↓9.6 years↑
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Roshan, Hidden Magister78%
$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."
+1 more matching line
Rukarumel, Biologist76%
$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."
Ravenous Robots76%
$1.45↓#7969↓0.00↓0.5 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Robot artifact creature token."
Xenograft74%
$0.94↓#14289↓0.4015.3 years↑
"Each creature you control is the chosen type in addition to its other types."
Sai, Master Thopterist72%
$0.38↓#820↑0.24↓8.1 years↑
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Pinnacle Emissary72%
$1.55↓#5634↓0.31↓1.1 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Drone artifact creature token with flying and "This token can block only creatures with flying.""
Mycosynth Lattice70%
$35.50↑#2051↑1.22↑22.6 years↑
"All permanents are artifacts in addition to their other types."
Silverskin Armor70%
$0.22↓#19132↓0.25↓15.6 years↑
"Equipped creature gets +1/+1 and is an artifact in addition to its other types."
Poetic Ingenuity70%
$0.33↓#7953↓0.00↓2.8 years↓
"Whenever you cast an artifact spell, create a 3/1 red Dinosaur creature token. This ability triggers only once each turn."