Mechan Assembler 
Artifact Creature — Robot Artificer
$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.
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Malcator, Purity Overseer90%
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"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."
Mirrorworks90%
$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."
. If you do, create a token that's a copy of that artifact."
Replication Specialist89%
$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."
. If you do, create a token that's a copy of that artifact."
Ultron, Artificial Malevolence85%
$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."
. 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."
Towashi Songshaper84%
$0.10↓#25896↓0.00↓4.5 years↑
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol84%
$0.04↓#30426↓0.00↓3.8 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard84%
$0.04↓#27045↓0.27↑3.8 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Machinesmith Automaton84%
$0.17↓#17896↓0.00↓0.2 years
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Glaze Fiend84%
$0.17↓#24361↓0.00↓17.9 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
The Prydwen, Steel Flagship84%
$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.""
Yotian Dissident84%
$0.25↓#99120.29↑3.8 years↑
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Simulacrum Synthesizer83%
$16.44↑#1724↑0.75↑2.4 years↑
"Whenever another artifact you control with mana value 3 or greater enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control.""
Donatello, Way with Machines83%
$0.21↓#13634↓0.00↓0.5 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Mandible Justiciar83%
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"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Karstoderm82%
$0.05↓#31823↓0.35↑22.6 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Oreplate Pangolin82%
$0.14↓#16597↓0.121.1 years
"Whenever another artifact you control enters, you may pay . If you do, put a +1/+1 counter on this creature."
. If you do, put a +1/+1 counter on this creature."
Merry, Warden of Isengard82%
$0.23↓#5255↑0.253.2 years↑
"Whenever one or more artifacts you control enter, create a 1/1 white Soldier creature token with lifelink. This ability triggers only once each turn."
Fateful Discovery82%
$5.99↑#13444↓0.00↓0.1 years↓
"Whenever an artifact you control enters, draw a card."
Mm'menon, Uthros Exile81%
$0.25↓#93170.06↓1.1 years
"Whenever an artifact you control enters, put a +1/+1 counter on target creature."
Surge Conductor80%
$0.36↑#2751↑0.37↑1.1 years
"Whenever another nontoken artifact you control enters, proliferate."