I've said this before, and I will say it again. What makes MW deckbuilding so special isn't the "mandatory" part of the building. Arguably every single "deckbuilding" game on the market today has elements that every deck will include as it makes them either playable, or better. From the ones I have played and love, there are a few examples I could give. If we look at one of the recently popular Android Netrunner, there are a few builds in particular, that, in order to be "competitive", need Account Siphon, as well as some amount of breakers, and economy. This is just one of many. You can't play Standard Magic the gathering without including lands in your deck, and you certainly can't be competitive without including "dual" lands. (Dada, I see your belcher and it is an exception, not a rule). As well, even if you look at minis games, which are closer to Mage Wars, have certain "necessities" that are required for tournament friendly builds.
Next, let's compare card pools to that of many other games. Let's face it: There aren't THAT many cards in Mage Wars. I mean, compared to Magic: The gathering or Warhammer, and the comparison isn't even there. This isn't the fault of the creators or the game itself, it simply means the game is young. Even Netrunner has a comparatively larger cardpool, as well as much faster churn rate (defined as new cards added to the old card pool in order to stimulate growth in players and the game itself). Again, this is due to the model of Mage Wars, which isn't a problem at all.
What makes Mage Wars Deckbuilding so special is the sheer amount of splashes you can make in a build. The fact that a Grizzly can be summoned and then have a circle of fire cast on it... from a priestess. What also makes this game so interesting is that there is no "tournament" formula. As the player skill is relatively similar and the same people come to tournaments, the builds tend to be the same. If we took everyone on these forums and had a massive single elem tournament, we would see builds we never even thought of.
As well, free actions are nigh unbeatable. With proper thought and planning, free actions become a bane instead of a boon. Battle forge is the strongest spawnpoint we have right now, we the reason being that what we cast is static, hard to destroy, and cheap. Battle forge itself is hard to destroy, but it is very, very beatable. Even when combined with Wizard's Tower, it is still beatable.
Dude.