Three? The original idea, which I'm willing to try and stick with, has you using a full deck. With mana increasing with time spent in battle. So you need at least a deck's worth of spells. 

Right now I'm trying to build on the plot which is currently as follows:

[indent][indent]"You were exiled from your home universe, just before it was destroyed. You don't know how you know and you can't prove it, but you know that whatever destroyed your universe, is here in this new universe with you. You don't know if he's here to kill the survivors, or if he want's to destroy this universe as well, either way, things won't end well for you. You all stand together inside a circle of stones (very similar to Stonehenge) and the world lies before you, alien and unknown, yet somehow familiar.

You have to find and defeat the cause your universe's obliteration before it strikes again. The question is, will this universe help or hinder you? And will you all stick together or will you split up hoping to cover more ground?"[/indent][/indent]


Also, I'm not sure how to make the turns work in a forum setting, especially with instants interrupting the turn order. I think each round, you will be able to "play a land" whenever you take a moment to remember a place that you have been to in your travels. I'm thinking of limiting max mana by the number of years the character has been alive, allowing one mana per year to be added to the "deck" ... that seems like a nice cap. then to keep spells known from getting to ridiculous, for each mana you "own" you may learn two spells that share it's color with the mana you just picked up. (multi-colored spells can be learned with any of it's constituent colors, so long as you already have all the other colors in your "deck".

How does all of that sound? And does someone want to help run this I'm gunna need it I think.