Master's Guide-Mural // Master's Manufactory
When this artifact enters, create a 4/4 white and blue Golem artifact creature token.
Craft with artifact 
(, Exile this artifact, Exile another artifact you control or an artifact card from your graveyard: Return this card transformed under its owner's control. Craft only as a sorcery.)
: Create a 4/4 white and blue Golem artifact creature token. Activate only if this artifact or another artifact entered the battlefield under your control this turn.
"The Fomori are a foul and distant memory, but their war machines taught us much about large-scale armorcraft." —Anim Pakal, Thousandth Moon
Illustrated by Racrufi
This printing
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You may exile tokens you control as part of the materials required. However, because they aren't cards and won't stay in exile, any abilities that refer to what you "used to craft" the back faces won't refer to anything.
If a card that isn't a transforming double-faced card becomes a copy of a card with craft, it'll stay in exile if you activate the craft ability. It won't return to the battlefield.
The ability of Master's Manufactory can be activated no matter what happened to the artifact after it entered under your control. It may have left the battlefield, stopped being an artifact, or another player may have gained control of it.
The back faces of some cards with craft refer to cards "used to craft" it. This refers to the cards exiled as part of the cost of the craft ability of the front face. Those cards are considered to be "used to craft" that permanent as long as they remain exiled and the permanent remains on the battlefield, even if the permanent's controller changes or some of its characteristics change (because of a copy effect, for example.)
If the materials required include multiple objects, you may exile some of them from among permanents you control and the rest from among cards in your graveyard. You don't have to choose all permanents or all cards from your graveyard.
