Great question.
My suggestions:
-If you haven't already, sign up for an account @ boardgamegeek.com and give Mage Wars your honest review score.
-Participate in the BGG forums by helping out new players with questions and offer up suggestions for them to try and make there experiences more enjoyable.
-Go to your local game shop and teach your friends how to play. If they enjoy the game - ask them if they would go to boardgamegeek.com and show some love.
-"Like" the official Mage Wars Facebook page. Post comments, meet people in your area that love the game.
-Contribute in any other way you can - write-up an epic play session or review on BGG, if you use custom cut outs or minis with your set - post some pictures, (a tournament player at Origins had a Forcemaster mini that was DOPE!) sign up to be an ambassador, encourage your FLGS to run tournaments, find players in your area and start a league.
-Etc.
Personally, I am never more interested in a game than when I feel every person except me is playing and/or knows how to play it. Exposure is paramount in achieving this effect and by getting together at your FLGS and inviting onlookers to come spectate your games, running tournaments and the like we can bring more people into the fold. Im sure we are in collective agreement that Mage Wars is masterclass, and from what I can tell, the retention rate for this game is very high meaning we only need to get people's feet wet and metaphorically speaking, we do that by flooding the room with water... or blood, if that's your thing.
But here's the thing... blood will stain your jean cuffs, wear the black windbreakers.
Thanks for question Fentum!