Mechan Assembler 
Artifact Creature — Robot Artificer
$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.
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Malcator, Purity Overseer90%
$0.25↓#96870.063.7 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."
Mirrorworks90%
$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."
. If you do, create a token that's a copy of that artifact."
Replication Specialist89%
$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."
. If you do, create a token that's a copy of that artifact."
Ultron, Artificial Malevolence85%
$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."
. 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."
Machinesmith Automaton84%
$0.15↓#16390↓0.15↑0.3 years
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Towashi Songshaper84%
$0.11↓#26286↓0.12↑4.7 years↑
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol84%
$0.05↓#30820↓0.003.9 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard84%
$0.07↓#27483↓0.003.9 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Glaze Fiend84%
$0.19↓#24704↓0.0018.0 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
The Prydwen, Steel Flagship84%
$0.33↑#6907↑0.052.6 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.""
Donatello, Way with Machines84%
$0.20↓#13242↓0.20↑0.6 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Simulacrum Synthesizer83%
$17.20↑#1662↑0.84↑2.5 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.""
Karstoderm83%
$0.08↓#32143↓0.0022.7 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Oreplate Pangolin83%
$0.15↓#16595↓0.001.2 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."
Mandible Justiciar83%
$0.19↓#17024↓0.19↑3.7 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Yotian Dissident82%
$0.23↓#100600.45↑3.9 years↑
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Merry, Warden of Isengard82%
$0.33↑#5270↑0.003.3 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."
Surge Conductor82%
$0.33↑#2595↑0.45↑1.2 years
"Whenever another nontoken artifact you control enters, proliferate."
Fateful Discovery82%
$3.52↑#7680↑0.58↑0.2 years↓
"Whenever an artifact you control enters, draw a card."
Mm'menon, Uthros Exile80%
$0.25↓#90690.001.2 years
"Whenever an artifact you control enters, put a +1/+1 counter on target creature."