Heroic Beast Team 1-25 (updated)

Roles

Build Cycle

2

3

3

3

Shortest Cycle

11

4

4

4

Playable Anywhere

Reached level 25 of heroic with the same team in every stage, average level 15.1, leader is not relevant but the flood of murlocs helped me in some stages (My leader is level 11).
Force the first tower and try to pick chests an mines, when you have enough advantage and a second forward spawn point, unleash on him harpies and the tauren (some minis might still be pushing from before, if that's the case add the new mini to the previous group and use the Drake).
Use Whelps and S.A.F.E. to distract the boss and turn his aggro (also to take out troublesome enemies in the backline).
If you can take momentum in the beginning, you will stomp the boss in no time.
If you see that he repelled your first 2-3 push, just restart.
Poison on Harpies is probably the most useful of the talents of this team.

After Heroic level 25 stages have become very challenging, requiring a lot of tuning to the team, therefore I cannot provide you a well rounded team to move forward from this point (I will try to create individual guides in each mission if possible).