New Dark Troop

I suggest that Supercell's Clash of Clans should have a dark troop known as the centaur.
The centaur should cost 250-300 Dark Elixir and should take around 30 minutes.
Each centar may take 20 housing space and have 150-180 hit points and a 35 movement speed, notice that this is faster than any troop currently in the game.
The centaur is a dark troop that remains on the ground. Fairly similar to an archer but stronger and more range, also it uses dark elixir and 72x the training time. The centaur has a longer range than archers as well. The centaur uses a stronger bow for more power per shot.
Below is a link to a picture that I believe the centaur might look like and I take no credit for the picture, I did not create it, I just found it through the Internet.
http://vignette4.wikia.nocookie.net/...20140317190053
Please give me feedback and tips on how to improve this troop.