Efficient Construction 
Enchantment
$0.50 #2603 0.14 9.7 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?
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Myrsmith94%
$0.13↓#8000↓0.25↑16.1 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."
Pinnacle Emissary92%
$1.35↑#5195↓0.221.2 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↑#7117↓0.35↑0.6 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Robot artifact creature token."
Sai, Master Thopterist90%
$0.35↓#810↑0.228.3 years↓
"Whenever you cast an artifact spell, create a 1/1 colorless Thopter artifact creature token with flying."
Etherium Spinner89%
$0.25↓#14197↓0.215.3 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%
$0.23↓#16214↓0.00↓1.2 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.""
Virtual Assistant84%
$0.22↓#30166↓0.200.3 years↓
"Whenever you cast a spell using teamwork, create a 1/1 colorless Robot Hero artifact creature token with flying."
Whirlermaker84%
$0.07↓#20161↓0.00↓10.1 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%
$3.34↑#17270↓0.230.3 years↓
"Whenever you cast a red spell, create a 2/1 colorless Robot Hero artifact creature token with flying."
Poetic Ingenuity81%
$0.33↓#8110↓0.00↓2.9 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%
$0.42↓#1439↑0.39↑17.7 years↑
"Whenever you cast an enchantment spell, create a 4/4 white Angel creature token with flying."
Alela, Artful Provocateur80%
$0.43↓#5489↓0.177.0 years↓
"Whenever you cast an artifact or enchantment spell, create a 1/1 blue Faerie creature token with flying."
Thopter Spy Network80%
$0.32↓#933↑0.2111.3 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%
$0.19↓#7149↓0.175.7 years↓
"Whenever you cast your second spell each turn, create a 1/1 white Spirit creature token with flying."
Golem Foundry80%
$0.28↓#5669↓0.27↑16.1 years↑
"Whenever you cast an artifact spell, you may put a charge counter on this artifact."
Biotransference78%
$8.16↑#4361↓0.31↑4.0 years↓
"Whenever you cast an artifact spell, you lose 1 life and create a 2/2 black Necron Warrior artifact creature token."
Luminous Angel78%
$0.71↑#22849↓0.1823.0 years↑
"At the beginning of your upkeep, you may create a 1/1 white Spirit creature token with flying."
Saheeli, Jewel of Avishkar78%
$0.25↓#16076↓0.070.0 years↓
"Whenever you cast a noncreature spell, create a 1/1 colorless Thopter artifact creature token with flying."
Digsite Engineer78%
$0.72↑#5000↓0.155.5 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.""
Thopter Foundry77%
$0.29↓#8045↓0.1317.5 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."