Captain Storm, Cosmium Raider 
Legendary Creature — Human Pirate
$0.23 #5974 0.21 2.8 years
Whenever an artifact you control enters, put a +1/+1 counter on target Pirate you control.
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Yotian Dissident81%
$0.25↑#9912↓0.293.8 years
"Whenever an artifact you control enters, put a +1/+1 counter on target creature you control."
Mm'menon, Uthros Exile79%
$0.25↑#9317↓0.06↓1.1 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on target creature."
Donatello, Way with Machines76%
$0.21↓#13634↓0.00↓0.5 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Machinesmith Automaton76%
$0.17↓#17896↓0.00↓0.2 years↓
"Whenever another artifact you control enters, put a +1/+1 counter on this creature."
Oreplate Pangolin74%
$0.14↓#16597↓0.121.1 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 Star72%
$0.18↓#12782↓0.38↑1.2 years↓
"Whenever an artifact you control enters, put a +1/+1 counter on this card."
Ingenious Smith71%
$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."
Karstoderm70%
$0.05↓#31823↓0.35↑22.6 years↑
"Whenever an artifact enters, remove a +1/+1 counter from this creature."