When you cast a spell using a card's disturb ability, the card is put onto the stack with its back face up. The resulting spell has all the characteristics of that face.
Lunarch Veteran // Luminous Phantom
If you copy a permanent spell cast this way (perhaps with a card like Double Major), the copy becomes a token that's a copy of the card's back face, even though it isn't itself a double-faced card.
A spell cast this way enters the battlefield with its back face up.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Igor Kieryluk
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