Surge Conductor 
Artifact Creature — Robot
$0.33 #2595 0.45 1.2 years
Whenever another nontoken artifact you control enters, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
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Metastatic Evangel87%
$0.37↑#1514↑0.30↓2.3 years↑
"Whenever another nontoken creature you control enters, proliferate."
Machinesmith Automaton86%
$0.15↓#16390↓0.15↓0.3 years
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Donatello, Way with Machines86%
$0.20↓#13242↓0.20↓0.6 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Towashi Songshaper86%
$0.11↓#26286↓0.12↓4.7 years↑
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol86%
$0.05↓#30820↓0.00↓3.9 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard86%
$0.07↓#27483↓0.00↓3.9 years↑
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Glaze Fiend85%
$0.19↓#24704↓0.00↓18.0 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Karstoderm84%
$0.08↓#32143↓0.00↓22.7 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Oreplate Pangolin84%
$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."
. If you do, put a +1/+1 counter on this creature."
Yotian Dissident83%
$0.23↓#10060↓0.453.9 years↑
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Mandible Justiciar82%
$0.19↓#17024↓0.19↓3.7 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Mm'menon, Uthros Exile82%
$0.25↓#9069↓0.00↓1.2 years
"Whenever an artifact you control enters, put a +1/+1 counter on target creature."
Mechan Assembler82%
$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."
Tidus, Blitzball Star80%
$0.22↓#12726↓0.06↓1.4 years
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Ingenious Smith79%
$0.18↓#13122↓0.00↓5.2 years↑
"Whenever one or more artifacts you control enter, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Fateful Discovery79%
$3.52↑#7680↓0.58↑0.2 years↓
"Whenever an artifact you control enters, draw a card."
Atraxa, Praetors' Voice79%
$26.03↑#23621.77↑9.9 years↑
"At the beginning of your end step, proliferate."
Tainted Observer77%
$0.27↓#7212↓0.393.7 years↑
"Whenever another creature you control enters, you may pay 
. If you do, proliferate."
. If you do, proliferate."
Vermiculos77%
$0.33#29534↓0.00↓23.0 years↑
"Whenever an artifact enters, this creature gets +4/+4 until end of turn."
Veil of Assimilation76%
$0.11↓#18833↓0.00↓3.7 years↑
"Whenever this artifact or another artifact you control enters, target creature you control gets +1/+1 and gains vigilance until end of turn."