Troll and Drake Rush
You will need two things to perform this enjoyable and surprisingly effective rush: a custom Troll hero with the Untamed Allegiance power (no others) and a map with a fire drake lair. If you have these, you're set.
Step One: Immediately once the game starts, purchase your Troll hero (it should be 600 resources).
Step Two: Once your hero is complete, rush it to the fire drake lair and convert it.
Step Three: Head over to your opponent's base and start recking havoc. Be sure to use your troll as a meatshield: the drake packs a punch but isn't that tough.
Step Four: GG