Perimeter Patrol 
Creature — Human Soldier
$0.05 #30820 0.00 3.9 years
Whenever an artifact you control enters, this creature gets +1/+0 until end of turn.
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Cards similar to Perimeter Patrol expected a card that isn't here?
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Phalanx Vanguard100%
$0.07↑#274830.003.9 years
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Towashi Songshaper100%
$0.11↑#262860.12↑4.7 years
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Glaze Fiend100%
$0.19↑#247040.0018.0 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Mandible Justiciar98%
$0.19↑#17024↑0.19↑3.7 years
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Vermiculos94%
$0.33↑#295340.0023.0 years↑
"Whenever an artifact enters, this creature gets +4/+4 until end of turn."
Salivating Gremlins92%
$0.02↓#258240.0510.1 years↑
"Whenever an artifact you control enters, this creature gets +2/+0 and gains trample until end of turn."
Oreplate Pangolin92%
$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."
Machinesmith Automaton92%
$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 Machines92%
$0.20↑#13242↑0.20↑0.6 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Karstoderm90%
$0.08↑#321430.0022.7 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Weldfast Wingsmith88%
$0.05#312790.0010.1 years↑
"Whenever an artifact you control enters, this creature gains flying until end of turn."
Glassdust Hulk88%
$0.10↑#18461↑0.10↑17.5 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn and can't be blocked this turn."
Tidus, Blitzball Star88%
$0.22↑#12726↑0.061.4 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Veil of Assimilation88%
$0.11↑#18833↑0.003.7 years
"Whenever this artifact or another artifact you control enters, target creature you control gets +1/+1 and gains vigilance until end of turn."
Ingenious Smith87%
$0.18↑#13122↑0.005.2 years↑
"Whenever one or more artifacts you control enter, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Surge Conductor86%
$0.33↑#2595↑0.45↑1.2 years↓
"Whenever another nontoken artifact you control enters, proliferate."
Glint Hawk Idol86%
$0.07↑#299240.0716.1 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."
Yotian Dissident86%
$0.23↑#10060↑0.45↑3.9 years
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Eye of Malcator84%
$0.14↑#23760↑0.063.7 years
"Whenever another artifact you control enters, this artifact becomes a 4/4 Phyrexian Eye artifact creature until end of turn."
Mechan Assembler84%
$0.26↑#10026↑0.001.2 years↓
"Whenever another artifact you control enters, create a 2/2 colorless Robot artifact creature token. This ability triggers only once each turn."