From Mirrodin Frequently Asked Questions, Tuesday, September 23, 2003:
Soul Foundry
Artifact
Imprint -- When Soul Foundry comes into play, you may remove a creature card in your hand from the game. (The removed card is imprinted on this artifact.)
, : Put a creature token into play that's a copy of the imprinted creature card. X is the converted mana cost of that card.
Soul Foundry puts a token copy of the imprinted card into play. The token is put into play, not played.
The token is an exact copy in every way, except that it's a token, not a card.
Most creature tokens have mana cost and converted mana cost 0, but a creature token put into play by Soul Foundry has the same mana cost and converted mana cost as the card it copies.