Perimeter Patrol 
Creature — Human Soldier
$0.04 #30426 0.00 3.8 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%
$0.04#270450.27↑3.8 years
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Towashi Songshaper100%
$0.10↑#258960.004.5 years
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Glaze Fiend100%
$0.17↑#243610.0017.9 years↑
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Mandible Justiciar98%
$0.18↑#16734↑0.24↑3.6 years
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Vermiculos94%
$0.32↑#292100.25↑22.9 years↑
"Whenever an artifact enters, this creature gets +4/+4 until end of turn."
Oreplate Pangolin92%
$0.14↑#16597↑0.12↑1.1 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."
Salivating Gremlins92%
$0.04#255940.079.9 years↑
"Whenever an artifact you control enters, this creature gets +2/+0 and gains trample until end of turn."
Machinesmith Automaton92%
$0.17↑#17896↑0.000.2 years↓
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Donatello, Way with Machines91%
$0.21↑#13634↑0.000.5 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Karstoderm90%
$0.05↑#318230.35↑22.6 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."
Weldfast Wingsmith88%
$0.07↑#310830.43↑9.9 years↑
"Whenever an artifact you control enters, this creature gains flying until end of turn."
Tidus, Blitzball Star88%
$0.18↑#12782↑0.38↑1.2 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Veil of Assimilation88%
$0.11↑#18468↑0.27↑3.6 years
"Whenever this artifact or another artifact you control enters, target creature you control gets +1/+1 and gains vigilance until end of turn."
Glassdust Hulk87%
$0.10↑#18236↑0.0717.3 years↑
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn and can't be blocked this turn."
Ingenious Smith87%
$0.16↑#13239↑0.005.1 years↑
"Whenever one or more artifacts you control enter, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Yotian Dissident86%
$0.25↑#9912↑0.29↑3.8 years
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Glint Hawk Idol86%
$0.11↑#296360.0015.9 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."
Eye of Malcator84%
$0.08↑#23466↑0.75↑3.6 years
"Whenever another artifact you control enters, this artifact becomes a 4/4 Phyrexian Eye artifact creature until end of turn."
Mechan Assembler84%
$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."
Mm'menon, Uthros Exile84%
$0.25↑#9317↑0.061.1 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on target creature."