Ultron, Artificial Malevolence 
Legendary Artifact Creature — Robot Villain
$10.66 #5333 0.00 0.2 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.
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Mirrorworks93%
$2.35↓#3066↑0.36↑15.6 years↑
"Whenever another nontoken artifact you control enters, you may pay
. If you do, create a token that's a copy of that artifact."
Replication Specialist93%
$0.19↓#13353↓0.56↑4.5 years↑
"Whenever a nontoken artifact you control enters, you may pay 
. If you do, create a token that's a copy of that artifact."
Mechan Assembler85%
$0.28↓#10210↓0.16↑1.1 years
"Whenever another artifact you control enters, create a 2/2 colorless Robot artifact creature token. This ability triggers only once each turn."
Malcator, Purity Overseer77%
$0.22↓#9524↓0.19↑3.6 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."
The Prydwen, Steel Flagship73%
$0.37↓#6786↓0.32↑2.5 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.""
Artificer Class72%
$16.10↑#4092↑0.24↑4.2 years↑
"At the beginning of your end step, create a token that's a copy of target artifact you control."
Urza, Prince of Kroog71%
$0.57↓#43930.26↑4.0 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."
Glint Hawk Idol71%
$0.11↓#29636↓0.0015.9 years↑
"Whenever another artifact you control enters, you may have this artifact become a 2/2 Bird artifact creature with flying until end of turn."
Schema Thief71%
$0.38↓#10550↓0.25↑3.4 years↑
"Whenever this creature deals combat damage to a player, create a token that's a copy of target artifact that player controls."
Eye of Malcator70%
$0.08↓#23466↓0.75↑3.6 years↑
"Whenever another artifact you control enters, this artifact becomes a 4/4 Phyrexian Eye artifact creature until end of turn."
Mechanized Production70%
$3.07↓#994↑0.68↑9.6 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."