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I looked over the Gatherer rulings and it didn't mention anything about it, nor does it mention permanents on the card or in the rulings.
I ask because I wanted to know if I could use Æther Vial to summon any artifact from my hand with March of the Machines in play.
On any given card, a card that specifies a permanent type without explicitly saying 'card' only affects permanents in play (unless otherwise specified by the card). If you have an artifact card in your hand, it is exactly that - an artifact card, and not an 'artifact'...
Relevant rule
109.2. If a spell or ability uses a description of an object that includes a card type or subtype, but doesn’t include the word “card,” “spell,” “source,” or “scheme,” it means a permanent of that card type or subtype on the battlefield.
