All permanents are artifacts in addition to their other types.
All cards that aren't on the battlefield, spells, and permanents are colorless.
Players may spend mana as though it were mana of any color.
Anthony S. Waters
The Latticeâ€™s first ability causes Auras to become artifacts. Combined with March of the Machines from the Mirrodin set, this can then make those Auras become creatures. An Aura thatâ€™s also a creature canâ€™t enchant anything. Itâ€™s unattached the next time state-based actions are checked, and then immediately put into its ownerâ€™s graveyard as a second state-based action.
The Latticeâ€™s third ability lets players spend even colorless mana as though it had a color. However, it doesnâ€™t remove restrictions on the mana. For example, Mycosynth Lattice doesnâ€™t allow mana from Vedalken Engineer to be used to cast a nonartifact spell.
Mycosynth Latticeâ€™s second ability makes everything, in every zone of the game, colorless.
Mycosynth Lattice turns all permanents on the battlefield into artifacts. Spells on the stack and cards in other zones arenâ€™t permanents, so those spells and cards donâ€™t become artifacts.