It seems to me that chess clocks could take care of a lot of this. Set each side for 30 minutes (for example)...if you play slow, you are using your time, not your opponents.  It doesn't solve everything, i know...and it has the added con of adding to cost. A quick perusal online and the cheapest I could find was 21$ each; I doubt stores would want to eat the cost of (# of players divided by 2 times 21$) up front even though once regular tournaments started happening, the cost could be offset for a nominal added tax. It woud also change the play a bit as everything would have to back and forth play: player 1 places a spell face down and hits the closck. Player two places a spell face down and hits the clock. Player one places a second spell face down and hits the clock, etc. Dunno if that would work for actual game play (I have the game but haven't had the opportunity to play yet. Sad face is sad).

The only other thing I can think of at the moment, tourney wise, is to have a set of parameters that favors each play style pre-set for tourneys. At the beginning of each tourney, after all decks have been registered, one of the parameters is selected randomly. Yes, a certain style would then have an advantage, but one style would never be guaranteed that advantage and it might promote different builds from people (goofballs like me, admittedly) who would hope that it was my deck build play style that gets the advantage. Of course, it would probably irk more people than it would satisfy...

Hmmm...perhaps my "solutions" aren't good for solving the problem after all.