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I. Character Cards
A. Character cards are who you are. Typically only one per deck; however, some go together, such as Dark Paladin with Paladin. One must be out at all times; if a certain 'pay cost', determined by the card, is paid, you may randomly switch to another card. If there is only one other card, then you must choose that one if you pay the 'pay cost'.
B. Some character cards may have abilities that are printed on the card. For example, Valgaror the Vicious has the ability to choose an equipment card from the deck, and then reshuffle the deck afterwards. This may only be used once, upon playing the card, and only if the player wishes to. There may also be other benefits - or negative side effects. For example, the Suzy the Mime card grants a bonus to total health when it's played - which is taken away when you switch to another character card - but also requires two mana to be spent every turn in order to keep this bonus while the card is out.
C. Some cards may force another player to switch their character card, which are only applicable if the player has multiple character cards.
D. Some attack cards are character specific. See "Attack Cards".

II. Attack Cards
A. All attack cards require mana, from a simple sword slash to even the most complicated of spells. For example, Perseverence's Descent costs a single neutral mana, whereas Animus Pulsus costs seven good mana, and a single chaotic one.
B. Character specific attacks are specific to a single character. While any character can use Sword Slash, only the Emperor can use Perseverence's Descent. Usually printed on the attack card.

III. Mana
A. There are five types of mana - chaotic, lawful, good, evil, and neutral.
B. Mana resources -

IV. Modifier Cards
A. These cards allow you to bypass certain rules. They can either change the character card you're currently use, or they may be used on action cards.
B. Action Modifiers generally allow for extra damage to be done, or to lower the mana cost.
C. Character Modifiers can do any number of things, such as allowing that character to use 'banned' attacks, such as Alnette using Perseverence or Drathi to use Dark Excalibur.

V. Character-Specific and Banned Cards
A. Examples of character specific attacks are Perseverence, Dark Excalibur, and Suzy's Rosaries. These are limited to that specific character.
B. In addition, characters may have specific types of attack they cannot use. The Emperor, for example, may not use swords or any form of magic other than Praise the Empress. Scribbler may not use any forms of weaponry, but has many forms of magic specific to her. Et cetera.

VI. Turn Structure
A. A six-sided die is rolled. The person with the highest number goes first.
B. The first person draws six cards.

This is really cool!

hehe Animus Pulsus. Would seven mana be a lot? If is, that's good because you don't want people spamming Animus Pulsus.

@ Pally:
Thanks. Not my idea, of course, but my ego loves the stroking anyway.
Seven mana would be a lot. That's why I made it so. I basically went to your journal and looked for one of the spells that took a lot out of you. Might end up adding a health deduction, too.

@ Lightning:
Isn't it though? I really want a Lady Justice and a Pally deck. A good deck, you know?

@ Zachary
Good! I was trying to stray away a bit from MtG, so your input will be welcome.

there is a main character that starts out on the field.

No I have not considered that at all, I had simply created a base game, that had chaotic, lawful and neutrals. Would you mind elaborating on alignment prerequisites?

That's something like how I wanted the rules to go... so, yes, that's great.
I love the idea of changing a character's alignment, however. Instead of having different character cards, there could be base character cards, that change depending on the amount of mana available... though, of course, not all the cards could swing in every direction.
This is an interesting concept.