Match-ups for Interesting Shorter Games

I'm wondering what would be a good matchup if I only have a short amount of time to play.  Do people have recommendations for what Hero/Villian/Enviornment combinations make for interesting, shorter games?  I'm not looking for unbalanced games where the heroes smack down a villain really quickly (or vice versa), but games that could go either way but tend not to take as long.  I'm thinking it would have to involve some of the less complicated heroes vs. villains that don't get a ton of cards in play, as both of those tend to slow gameplay down.  Suggestions?

Plague Rat, Iron Legacy are my two short classics: nowhere to run nowhere to hide except a meteor storm...

For the shortest possible game, Iron Legacy, every time. High chance of losing, but you asked for a short game, not a victorious one ;).

Ambuscade can be reasonably quick due to his relatively low health (as long as he doesn't manage to stay cloaked for ages).

Plague Rat if you have Chrono Ranger on the team - those two tear each other to bits.

I have yet to have anything even approaching a long game against Wager Master. Cosmitron in Omnitron 4 is done pretty quick too, just not ever in your favor. >.>

plague rat and chrono ranger is one of my favorite tear each other up hit em hard matchups.

A fun, and surprisingly quick, game is Legacy, Ra, Wraith, and another damage dealer against Akash. With the pumped damage Legacy+Ra+Wraith can dish out, the limbs fall fast and the game goes quick.

Variant (Mad Bomber) Baron Blade isn't a bad choice, either. Especially since letting the game drag on generally isn't in the players' favor. Paired with a reasonably straightforward environment (Insula Primalis, Megalopolis, even Ruins of Atlantis - just not places like Tomb of Anubis or Freedom Tower), it should be a reasonably quick game.