[@Suneli] That idea has potential if it's fleshed out. While it's pretty complicated, the fact that you're willing to work with GMs shows you're serious about keeping things fair. Plus the randomness could be an interesting weakness, if she gets the wrong type of magic for a particular situation.

It'd be tricky, but as Majora's End said, it can work for RPs. That and yes there could be some low-level prediction involved, although I'd keep it pretty vague and limited to the near future.

Two suggestions for how to make the concept workable and relatively simple: One is her weapon could be a deck of cards that turn into projectiles when thrown (I had a magical girl in another RP who did this with playing cards). Every so often, she can use a card to predict an enemy's move, but the vision is very brief and the ability has a cooldown period of several minutes. Every day, she also gets a random slight boost or alteration to her abilities based on a Major Arcana card, of which she'd only start out with a few. They could also have disadvantages - the Strength card, for example, could trade her predictions for increased attacking power.

The other suggestion is that the random card determines her weapon/item for the day, based on the four Minor Arcana suits: a sword, a baton, a disc or a cup. Each would have their strengths and limits - sword would deal physical damage and be for close combat, wand or staff could channel magical energy attacks, throwing disc would make her a ranged fighter that day, and a cup could contain a potion that would buff or heal allies but would have no offensive use. She'd have to train a lot to adapt her fighting style accordingly. You could also include the prediction thing though, that would be a constant.

Hope that helped, and I'm up for chatting if you want to discuss ideas :)

[@Sinsystems] Nice, a healer! I was wondering if we were going to get one. That magic is creative, and I like the background, it fits the gritty but ultimately hopeful feel of this RP. 

The only issue is, she may be a bit too young. SimpleWriter and I envision the characters generally being between 15-19 years old, although there can be a few older exceptions, like Veronica. So she could be 15, maybe 14 if you feel it'd work best with her being the youngest?

Anyway, looking forward to seeing the CS!