Mystic Forge

Because you never "cast" a land card, Mystic Forge doesn't allow you to play an artifact land from the top of your library.

Mystic Forge lets you look at the top card of your library whenever you want (with one restriction—see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.

You still pay all costs for a spell you cast from your library, including additional costs. You may also pay alternative costs.