The most strongest hero in Castle Clash?

In my opinion is Minotaur Chieftain! This is a legenday hero and his skill is called Body Slam. The abilities is to damages, stuns and reduces the energy of multiple ground units but without effect on flying units. Unofrtunately, this hero can only be obtained by purchasing 150,000 Gems, that is equal to $900 from the gem store.

At level one his skill hits 10 random ground units, dealing 50% DMG, inflicting Stun for 1.0 sec, and reducing Energy by 10%. (Cooldown: 6 secs). Instead, at level 9 are affected 50 random ground units, dealing 210% DMG, inflicting Stun for 3.0 sec, and reducing Energy by 60% with the same cooldown.

But whats your opinion?