New troop ideas

Which one of these troops seems the most promising?

the gorgon:
Training cost: 50 dark elixir
Training time: 10 minutes
Housing space:10
Freezes per second: .5
Freeze duration: 1 second
Hit points: 300
Movement speed: 16
Damage type: area splash
Description: The will turn defensive structures to stone, it's rays will hit up to 3 defensive structures at a time.
Reference art: From Google image search:
http://fc05.deviantart.net/fs71/i/20...er-d3jrvil.jpg

The Siren:
Training cost: 150 dark elixir
Training time: 20 minutes
Housing space: 15
Hit points: 2500
Movement speed: 24
Description: The siren will use her voice to make any defensive structures she is within range of target her instead of other troops, allowing them to reek havoc and destroy the defenses.
Reference art: From Google image search:
http://lolwp.com/wp-content/uploads/...assiopeia1.jpg

The hydra (air troop):
Training cost: 250 DE
Training time: 45 minutes
Housing space: 30
Damage per second: 200-300
Hit points: 2000
Movement speed: 24-16
Description: The hydra will grow more heads a its health lowers, therefore increasing its damage, but decreasing its speed. At 2/3 health the hydra will grow a second head, increasing its damage 25% to 250, and lowering its speed to 18, and when it is at 1/3 health it will grow a third head, increasing its damage 20% (from 250) to 300, and lowering its speed to 16.
Reference art: From Google image search:
http://img3.wikia.nocookie.net/__cb2...ategory%29.jpg