Mechanic Idea: "Weave" a spell, i.e. use multiple cards in order to cast it

Been reading Wheel of Time?

While, the basic idea is similar to multicoloured use of energy in Pokemon or Mana in Magic.

The main issue you will have to deal with here is that you still need a place to hold the information of what a spell costs, does, etc. This might be a mat, or it might be in the rulebook: if it's in the rulebook you're going to spend a lot of time flipping around, and if it's on a mat it's going to take quite a bit of space...and either way you would be likely to telegraph your next move.

Of course the third solution is to make your own spells by chaining effects like Dominion or Puzzle Strike: for example with the Firestorm it might be that each fire card is something like "deal 2 damage or target player discards a card" and the air card is "add an additional target", so combined the 3 cards would make "deal 4 damage to 2 targets or 2 target players discard 2 cards". In this way you would still get the combined weave you were looking for, while keeping the information at hand. If you wanted some more unique weaves you could include a few character weaves which could combine the generic cards for a different effect and/or be usable as multiple basic weaves.

Just don't touch saidin.