Are you planning to control them all or just the Shamans?

If you do plan to control them all you better be good because playing just the shamans will be hard enough.

Avengers shield is a weak slow.. Its dispellable and on a pretty long cooldown, the good thing is that it is ranged thought.

The DK is a FAR better choice since he can pull people into the open and slow,stun and stall them.

If you plan to play all 5 you will get your ass handed down in 5vs5 for sure.