There are a variety of ways it can work, such as all-in All That Glitters decks, only artifacts-matter, or general goodstuff decks, and Im excited to see all that is possible
If you see a dash on the type line on any given card, then everything to the right of that dash is a subtype
As soon as you have things like Wheel of Fortune in your deck or several colours of different cards then your Prototype is pretty unplayable
It turns out that there are more than a few creatures that get a lot better when you turn them into artifacts and give them a mana ability, especially if you want to give yourself a repetitive stress injury in your wrist by tapping and untapping Horseshoe Crab, Simic Ragworm, Soliton, or Morphling until they kick you out of the LGS
No more than four copies of the same card, as determined by their card number, are allowed to be included in the same deck
It might be a paper printout in a sleeve, a custom card, or a professionally printed playtest card