I'm not sure if this really counts as "Alternative Play" (no rule changes), but I couldn't figure out where else to put it, so I'll put it here for now.
One of the major problems with Mage Wars is how not portable it is. The objective of this thread is to provide replacements for game components, with the ultimate objective being to fit the entire game (or a portable and playable subset of the game) into as few deck boxes as possible (small deck boxes; think UltraPro). This will be mostly accomplished by converting as many things as possible into 2.5"x3.5" cards and finding alternative ways to represent aspects of the game state. This is not intended to replace the game components, but rather to provide an alternative for players who find themselves traveling and want to bring the game along with them in as little space as possible.
Game BoardThis is the easiest to replace. The mage wars board is basically a modified tic-tac-toe board. Here are ways to simulate it:
Draw a board with chalk/markers/pencil/pretty much anything else. Say what you will, this works and is extremely easy and quick to do.
Mark zone intersections. These cards represent zone intersections. Just place 6 of them in a grid (or 20, if you absolutely need to define the arena outer boundaries), with as much space between them as you would like. The lines between the four-pointed stars become the zone borders. Also lets you build custom or multiplayer boards. The fancy purple-starred card replaces the initiative and compass tokens - just point it at the player with initiative, and use its compass when you need to determine directions at random.
Note that you don't have to use these cards -
literally anything will do for a zone intersection. I have played Mage Wars on a board made out of peanuts and tangerines (true story!). Post-its also work nicely.
Mage Status BoardsUse Status Cards Note that this life card is scaled to 5-per-row and color coded by severity of your injuries. But where, you ask, is the place for zero on either of these cards? Simple: just don't put the marker on the track if it is at zero (put it on your mage card or something if you are worried about losing it).
Use a Status DialInstructions for making a basic status dial here:
How to make a status dial (easily)Unfortunately, the current model is still about as bulky as a regular status board, though it does have fewer separate parts. I will see if I can improve upon this. I am considering 3D printing as an option.
Action and Quickcast MarkersThese are unnecessary. Take a page out of Magic and turn creatures sideways after they have acted. The facing of the card can be used to keep track of who owns it (and players generally remember which ones they own anyway). You can also keep your objects closer to your side of each zone.
Similarly, the quickcast marker can be represented by turning your Mage card (not the one with your picture, but the one with your abilities) sideways.
I have tried this, and it works well. I no longer use action markers in my own games, and barely notice the difference.
SpellbooksAs many have noted, the books are not necessary; keeping the cards in a deck works fine and takes up less space (also less setup and take-down time for the game). I personally prefer to use decks as a general rule, but in terms of portability they are an obvious choice.
DiceNot going to mess with these (yet). I can't think of any alternative that would use less space, and they aren't terribly bulky anyway.
Assorted TokensStill working on these. Not all should be replaced, but I think there is definitely some scope for reductions here.
Mage Ability Tokens If your mage's ability is one use per round, you can turn this card over to indicate when the ability has been used. If its ability is a pet-type ability, slide this card underneath its target. This works because all mages have at most one ability that requires a single special token (not considering warlord's vet tokens).
Mana and Damage MarkersMiniature dials can function to display health and mana very efficiently; each creature needs only one or two such dials. Examples:
These require a bit more assembly than the other solutions here, but the materials are very cheap.
This thread contains more information and resources for constructing these dials.
Imaginator proposes use of change such as pennies, dimes, etc. as damage/mana markers. He also proposes a "penny mage" optional variant for this. Depending on the type of change you use, this could potentially cut down on space a bit by reducing component sizes.
Stackable ConditionsThese are replacements for stackable conditions. Print them doublesided and put them under the creature so that the desired part of the card sticks out:
Initiative and Compass Rose MarkersThe following special zone intersection replaces the initiative and compass rose markers. Just point the initiative arrows at the player that currently holds the initiative.
Rulebook and CodexThe best way to carry these is in your brain. I am still thinking about a replacement codex, though.
Comments and suggestions welcome.