Auriok Edgewright 

Creature — Human Soldier
Metalcraft — This creature has double strike as long as you control three or more artifacts.
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Cards that do something similar expected a card that isn't here?
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Spiraling Duelist 100%
$0.05#29994
"This creature has double strike as long as you control three or more artifacts."
Squall, SeeD Mercenary 80%
$0.78#3820
"Whenever a creature you control attacks alone, it gains double strike until end of turn."
Rafiq of the Many 80%
$0.29#10463
"Whenever a creature you control attacks alone, it gains double strike until end of turn."