Drafting six colors is strictly verboten
As mentioned, it's possible that the card will enter circulation properly in later sets and expansions, but for now it's only for those who could beat the event itself
It will, however, improve your card memory skills, including your ability to estimate how likely you are to draw a card based on how many cards you've seen
No complex rules here, only solid ideas you can incorporate in your campaign
The prerelease kit's box also doubles as a deck box but it's not super sturdy and everyone at the event is going to have the same one, so you might get confused and mix up boxes
Most lists I see tend to exclude these cards and determining a final value really comes down to what other collectors are willing to pay for the difference represented