Efficient Construction 
Enchantment
$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.
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Cards similar to Efficient Construction 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.
Myrsmith94%
$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."
Sai, Master Thopterist94%
$0.38↓#820↑0.248.1 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Pinnacle Emissary93%
$1.55↑#5634↓0.311.1 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.""
Ravenous Robots91%
$1.45↑#7969↓0.00↓0.5 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Robot artifact creature token."
Etherium Spinner89%
$0.21↓#14066↓0.255.2 years↓
"Whenever you cast a spell with mana value 4 or greater, create a 1/1 colorless Thopter artifact creature token with flying."
Station Monitor88%
$0.17↓#16326↓0.01↓1.1 years↓
"Whenever you cast your second spell each turn, create a 1/1 colorless Drone artifact creature token with flying and "This token can block only creatures with flying.""
Whirlermaker84%
$0.06↓#19909↓0.00↓9.9 years
"
, 
: Create a 1/1 colorless Thopter artifact creature token with flying."
, : Create a 1/1 colorless Thopter artifact creature token with flying."
Iron Man, Tony Stark84%
$3.75↑#18208↓0.00↓0.2 years↓
"Whenever you cast a red spell, create a 2/1 colorless Robot Hero artifact creature token with flying."
Poetic Ingenuity81%
$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."
Sigil of the Empty Throne80%
$0.54↑#1355↑0.39↑17.6 years↑
"Whenever you cast an enchantment spell, create a 4/4 white Angel creature token with flying."
Alela, Artful Provocateur80%
$0.49↑#5315↓0.50↑6.9 years↓
"Whenever you cast an artifact or enchantment spell, create a 1/1 blue Faerie creature token with flying."
Thopter Spy Network80%
$0.38↓#936↑0.16↓11.1 years↑
"At the beginning of your upkeep, if you control an artifact, create a 1/1 colorless Thopter artifact creature token with flying."
Clarion Spirit80%
$0.20↓#7049↓0.05↓5.6 years↓
"Whenever you cast your second spell each turn, create a 1/1 white Spirit creature token with flying."
Golem Foundry80%
$0.30↓#5712↓0.12↓15.9 years↑
"Whenever you cast an artifact spell, you may put a charge counter on this artifact."
Biotransference78%
$9.61↑#4258↓0.43↑3.9 years↓
"Whenever you cast an artifact spell, you lose 1 life and create a 2/2 black Necron Warrior artifact creature token."
Virtual Assistant78%
$0.18↓#30120↓0.00↓0.2 years↓
"Whenever you cast a spell using teamwork, create a 1/1 colorless Robot Hero artifact creature token with flying."
Digsite Engineer78%
$0.57↑#4871↓0.16↓5.4 years↓
"Whenever you cast an artifact spell, you may pay 
. If you do, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
. If you do, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Luminous Angel78%
$0.69↑#22621↓0.2722.9 years↑
"At the beginning of your upkeep, you may create a 1/1 white Spirit creature token with flying."
Thopter Foundry77%
$0.22↓#7949↓0.3617.3 years↑
", Sacrifice a nontoken artifact: Create a 1/1 blue Thopter artifact creature token with flying. You gain 1 life."
, Sacrifice a nontoken artifact: Create a 1/1 blue Thopter artifact creature token with flying. You gain 1 life."
Third Path Iconoclast76%
$0.34↓#1354↑0.203.8 years↓
"Whenever you cast a noncreature spell, create a 1/1 colorless Soldier artifact creature token."