The Color Wheel in the FoxFire Universe
To fully understand what goes on in the FoxFire Universe, you may need some info on the realm that touched it, Dominaria. Fortunately, it's the same realm that has a card game based on it. There is a storyline FAQ (http://www.wizards.com/default.asp?x=magic/products/storylineFAQ) that could give you some info on Dominaria and what exactly is a Planeswalker, but that would give you rather limited info on how M:TG will affect the FoxFire Universe, which is more based on the Real World than Dominaria.
To better understand how the card game will affect the FoxFire Universe, you need to understand the primary driving force behind Dominaria, the Color Wheel. As you play the game, you'll notice that there are five 'colors' that magical energies, known as 'mana' comes from. There is also a colorless manner that mana can be used, but since any of the five colors can be used in this fashion (which usually involve artifacts) we won't discuss it here. However, in the FoxFire Universe, the Color Wheel will come into play more with the many characters and their personalities than the magical energies in the ground they're standing on at the time. At a later date, I will delve further in the colors behind some of the characters as well as how the five colors are represented in a 'simulated Real World setting' like the FoxFire Universe.
The Magic World
http://www.wizards.com/default.asp?x=magic/products/storylineWOM
This page is a quick overview of the five colors.
http://www.magic4you.nu/articles/2003-05/flavorandthecolorwheel.php
This one describes how the Color Wheel affects the Magic Cards.
Making Magic in Color Weeks
A fellow writer on the M:tG site, Mark Rosewater, is working on a set of five articles that focus deeper on each of the five colors, which I do hope finishes so they can be a prime reference. These upcoming five pages will give you added insight on what these colors are and how some of the characters act in accordance to them.Green
http://www.wizards.com/default.asp?x=mtgcom/daily/mr43
White
http://www.wizards.com/default.asp?x=mtgcom/daily/mr57
Blue
http://www.wizards.com/default.asp?x=mtgcom/daily/mr84
Black
(To Be Announced)
Red
(To Be Announced)
Why Colors Clash
http://www.wizards.com/default.asp?x=mtgcom/feature/14
I really wish that they gave a bigger picture of the color wheel shown in this page, but the rest of the page show the reasons why some of the colors oppose each other. As a rule of thumb, look at the circle of colors shown at the back of a Magic card, or better yet, at Jasmine's medallion that's hanging around her neck. For each color, the two colors across from the color on the circle are opposing colors, while the colors neighboring it was compatible. Take Red, for example: White and Blue are opposing colors, while Green and Black are compatible to it.
However, just because two colors may be on opposites doesn't mean that they can't co-exist. There will be incidences where the two colors in question form a ying-yang dynamic. A prime example would be Adam Packbell, who has in his philosophy a combination of natural jest (a Green trait) with a desire for knowledge to further himself (a Blue trait). You can easily tell a person's traits in the comics by the Magic Decks they use as a key: Again, Adam's deck is the infamous Blue Green Madness deck which was the scourge of last year, given a Type 1 tweak with the Power Nine, of course.