Karstoderm 
Creature — Beast
$0.05 #31823 0.35 22.6 years
This creature enters with five +1/+1 counters on it.
Whenever an artifact enters, remove a +1/+1 counter from this creature.
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Cards similar to Karstoderm expected a card that isn't here?
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Machinesmith Automaton96%
$0.17↑#17896↑0.00↓0.2 years↓
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Donatello, Way with Machines96%
$0.21↑#13634↑0.00↓0.5 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Oreplate Pangolin95%
$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."
Tidus, Blitzball Star92%
$0.18↑#12782↑0.381.2 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Ingenious Smith92%
$0.16↑#13239↑0.00↓5.1 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 Dissident90%
$0.25↑#9912↑0.293.8 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Towashi Songshaper90%
$0.10↑#258960.00↓4.5 years↓
"Whenever another artifact you control enters, this creature gets +1/+0 until end of turn."
Perimeter Patrol90%
$0.04↓#304260.00↓3.8 years↓
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Phalanx Vanguard90%
$0.04↓#270450.273.8 years↓
"Whenever an artifact you control enters, this creature gets +1/+0 until end of turn."
Glaze Fiend89%
$0.17↑#24361↑0.00↓17.9 years↓
"Whenever another artifact you control enters, this creature gets +2/+2 until end of turn."
Mm'menon, Uthros Exile88%
$0.25↑#9317↑0.06↓1.1 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on target creature."
Mandible Justiciar88%
$0.18↑#16734↑0.24↓3.6 years↓
"Whenever another artifact you control enters, this creature gets +1/+1 until end of turn."
Vermiculos86%
$0.32↑#292100.2522.9 years
"Whenever an artifact enters, this creature gets +4/+4 until end of turn."
Arcbound Crusher86%
$4.08↑#6012↑0.22↓22.6 years
"Whenever another artifact enters, put a +1/+1 counter on this creature."
Elvish Archivist82%
$0.30↑#8625↑0.383.0 years↓
"Whenever one or more artifacts you control enter, put two +1/+1 counters on this creature. This ability triggers only once each turn."
Leonin Elder82%
$0.33↑#8032↑0.2922.9 years
"Whenever an artifact enters, you may gain 1 life."
Mechan Assembler82%
$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."
Savage Firecat82%
$0.28↑#307720.24↓24.9 years↑
"This creature enters with seven +1/+1 counters on it."
Surge Conductor82%
$0.36↑#2751↑0.371.1 years↓
"Whenever another nontoken artifact you control enters, proliferate."
Shipwreck Sentry82%
$0.10↑#24566↑0.00↓2.8 years↓
"As long as an artifact entered the battlefield under your control this turn, this creature can attack as though it didn't have defender."