When you feel comfortable drafting and building these kinds of ramp decks then you can more profitably start experimenting with other colours and themes
You can't choose "artifact" or "colorless" as Shelter asks you to choose a color, since those are not colors
With that being said, there are a fair number of issues with this rule: It doesnt make any flavor sense
All absentee bids must be submitted by 3:00 P.M
Swords to PlowsharesSwords to Plowshares - Creature Removal (1,157,472 Inclusions, 62% of 1,853,531 Decks) Swords to PlowsharesSwords to Plowshares plays out in fairly similar fashion to the permanent-based spot removal we already discussed, likely just becoming a board wipe that exiles every relevant creature on the board
Simply place your cards into an empty deck box and place the box somewhere convenient, like on a shelf or in your closet