Hi. Simple question. Thanks for answering. Does Mycosynth Lattice make every card in your library colorless? Or are they still the colors they naturally are?
Mycosynth Lattice's second ability, among other things, makes all "cards that aren't on the battlefield" colorless, including cards in libraries, hands, and graveyards (C.R. 400.1), but cards outside the game are not made colorless this way (for example, a player can still choose a multicolored card they own from outside the game due to Glittering Wish) (C.R. 400.10c; see also this thread).
Mycosynth Lattice and Library