Ultron, Artificial Malevolence 
Legendary Artifact Creature — Robot Villain
$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.
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Mirrorworks93%
$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."
Replication Specialist93%
$0.23↓#13634↓0.25↓4.7 years↑
"Whenever a nontoken artifact you control enters, you may pay 
. If you do, create a token that's a copy of that artifact."
Mechan Assembler85%
$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."
Malcator, Purity Overseer77%
$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."
Urza, Prince of Kroog74%
$0.47↓#45180.39↓4.1 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."
The Prydwen, Steel Flagship73%
$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.""
Artificer Class72%
$15.30↑#41690.43↓4.4 years↑
"At the beginning of your end step, create a token that's a copy of target artifact you control."
Glint Hawk Idol71%
$0.07↓#29924↓0.07↓16.1 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%
$0.36↓#10921↓0.37↓3.5 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%
$0.14↓#23760↓0.06↓3.7 years↑
"Whenever another artifact you control enters, this artifact becomes a 4/4 Phyrexian Eye artifact creature until end of turn."
Mechanized Production70%
$2.13↓#986↑0.709.7 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."