Mirrorworks 
Artifact
$2.29 #3121 0.30 15.7 years
Whenever another nontoken artifact you control enters, you may pay
. If you do, create a token that's a copy of that artifact.
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Replication Specialist100%
$0.23↓#13634↓0.254.7 years↓
"Whenever a nontoken artifact you control enters, you may pay 
. If you do, create a token that's a copy of that artifact."
Ultron, Artificial Malevolence93%
$6.81↑#4376↓0.60↑0.3 years↓
"Whenever another nontoken artifact you control enters, you may pay
. If you do, create a token that's a copy of it. If the token isn't a creature, it becomes a 2/2 Robot Villain creature in addition to its other types."
Mechan Assembler90%
$0.26↓#10026↓0.00↓1.2 years↓
"Whenever another artifact you control enters, create a 2/2 colorless Robot artifact creature token. This ability triggers only once each turn."
Mechanized Production82%
$2.13↓#986↑0.70↑9.7 years↓
"At the beginning of your upkeep, create a token that's a copy of enchanted artifact. Then if you control eight or more artifacts with the same name as one another, you win the game."
Schema Thief82%
$0.36↓#10921↓0.373.5 years↓
"Whenever this creature deals combat damage to a player, create a token that's a copy of target artifact that player controls."
Malcator, Purity Overseer82%
$0.25↓#9687↓0.06↓3.7 years↓
"At the beginning of your end step, if three or more artifacts entered the battlefield under your control this turn, create a 3/3 colorless Phyrexian Golem artifact creature token."
Artificer Class80%
$15.30↑#4169↓0.43↑4.4 years↓
"At the beginning of your end step, create a token that's a copy of target artifact you control."
Oltec Matterweaver80%
$0.90↓#3747↓0.252.5 years↓
"• Create a token that's a copy of target artifact token you control."
The Prydwen, Steel Flagship74%
$0.33↓#6907↓0.05↓2.6 years↓
"Whenever another nontoken artifact you control enters, create a 2/2 white Human Knight creature token with "This token gets +2/+2 as long as an artifact entered the battlefield under your control this turn.""
Towashi Songshaper74%
$0.11↓#26286↓0.12↓4.7 years↓
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol74%
$0.05↓#30820↓0.00↓3.9 years↓
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard74%
$0.07↓#27483↓0.00↓3.9 years↓
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Surge Conductor74%
$0.33↓#25950.45↑1.2 years↓
"Whenever another nontoken artifact you control enters, proliferate."
Cogwork Assembler74%
$0.08↓#13759↓0.06↓9.7 years↓
"
: Create a token that's a copy of target artifact. That token gains haste. Exile it at the beginning of the next end step."
Urza, Prince of Kroog74%
$0.47↓#4518↓0.394.1 years↓
"
: Create a token that's a copy of target artifact you control, except it's a 1/1 Soldier creature in addition to its other types."
Weapons Manufacturing74%
$1.85↓#32340.17↓1.2 years↓
"Whenever a nontoken artifact you control enters, create a colorless artifact token named Munitions with "When this token leaves the battlefield, it deals 2 damage to any target.""
Glaze Fiend73%
$0.19↓#24704↓0.00↓18.0 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Worldwalker Helm72%
$3.07↑#33860.292.5 years↓
"
,
: Create a token that's a copy of target artifact token you control."
Oreplate Pangolin72%
$0.15↓#16595↓0.00↓1.2 years↓
"Whenever another artifact you control enters, you may pay
. If you do, put a +1/+1 counter on this creature."