But how would you put 12 elements in such a map that they can all attack each other (because that is basically the problem).
Yes, that is impossible in a flat figure, but in a 3D map it will be also difficult.
However, I can see something in Terro's idea.
Give each element, let's say, 12 hexagons + a capital = 13.
You could use 3 or 4 different layers, like:
Underworld: Darkness, Death and Fire
World: Life, Gravity and Earth
Heaven: Air, Light and Water
Another Dimension: Aether, Time and Entropy
This made most sense to me:
Underworld: Darkness and Death are obvious, fire are the flames of hell
World: Earth (of course) and gravity should be placed in a normal world, life makes sense also.
Heaven: Air flies, light is about it for example: blessing and guardian angle, and water comes from heaven (rain)
Another dimension: Aether and Time are obvious, entropy gets here to make it 3:3:3:3 but entropy is also something we don't know on Earth.
You could add some cities (or whatever you call them) where you can buy or sell cards (if we chose so), where you could travel to other dimensions (also the cities there), they will be free places (no fights), but each time you go trough it, you lose 1 or 2 cards (to prevent people from abusing the free-ting).
I like this idea the best so far. A set of 4 overlapping maps, but could also be seen individually. And with having four separate maps, all which have many points of interactions to cross over into the different layers, it would be much easier to arrange and govern over. That way you don't have to have one super giant map to always look after.
Maybe even clans could be formed between the different layers. Like The Underworld, World, Heaven, and Dimensional would all be clans whom sort of war between each other, sort of. And as time progresses, new alliances could be formed between the elements, new enemies, etc.
Maybe things could go even as far as Elements crossing between the maps themselves. As new alliances form and old ones turn to enemies, over several turns, that Element could set up in an entirely differetn region.
Or maybe no clans at all and just those elements that are on similar levels get along to some extent better than with those of a different layer.
But then, the interaction between elements becomes a little more drawn out and specialized, since it would be difficult for Fire to interact with Air then, or vice versa. Or how would one enter and stay in the Heaven map? Would it be a series of flying cities with several Air Ports on the World map to connect them. And then maybe the Dimensional map could have access points on all three of the other maps. Maybe like Dimensional Gateways that were set up long ago when the World of Elements was still young.
but I think that would serve as the best and most realistic in terms of fiction way to go about things.
Also, I may not be online too often, or have the greatest of graphic skills, but I will draw up a draft, nothing too details, just a visual to go along with this idea. I'll try to get something done by this weekend. But yeah, I definitely think this would be the best idea, in terms of realistic fiction, and managing.