Steelclad Serpent 

Artifact Creature — Serpent
$0.08 #30923 0.06 18.0 years
This creature can't attack unless you control another artifact.
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Cards similar to Steelclad Serpent expected a card that isn't here?
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"This creature can't attack unless you control an artifact."
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"this card can't attack alone unless he has a +1/+1 counter on him."
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"This creature can't attack unless you've cast a creature spell this turn."
Gadrak, the Crown-Scourge82%
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"this card can't attack unless you control four or more artifacts."
Phyrexian Marauder80%
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"This creature can't attack unless you pay
for each +1/+1 counter on it."
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Wirecat76%
$0.19↑#320180.0028.0 years↑
"This creature can't attack or block if an enchantment is on the battlefield."