New Dark Elixir Troop - The Ghost

As everybody knows, a ghost is more or less invisible maybe slightly transclucent(mind my spelling tell me below if i am correct:o) So a ghost is invisible to 'Cannons','Archer Towers','Mortars' and also 'Clan Castle Troops' (excluding wizards and witches) and also Walls! There are invisible to these few defenses, yes, but has a relatively low hitpoints and also wizard towers deal double damage to Ghosts.

Info
Lvl1
Damage:28
Hipoints:54
Favourite Target: Defense Buildings
Attack Type: Single
Training Costs:300
Training Time:15 Minutes
*Wizard Towers deal double damage to Ghosts.

Lvl2
Damage:37
Hipoints:58
Favourite Target: Defense Buildings
Attack Type: Single
Training Costs:375
Training Time:15 Minutes
*Wizard Towers deal double damage to Ghosts.

Lvl3
Damage:47
Hipoints:62
Favourite Target: Defense Buildings
Attack Type: Single
Training Costs:450
Training Time:15 Minutes
*Wizard Towers deal double damage to Ghosts.

Lvl4
Damage:58
Hipoints:66
Favourite Target: Defense Buildings
Attack Type: Single
Training Costs:600
Training Time:15 Minutes
*Wizard Towers deal double damage to Ghosts.

Lvl5
Damage:69
Hipoints:70
Favourite Target: Defense Buildings
Attack Type: Single
Training Costs:800
Training Time:15 Minutes
*Wizard Towers deal double damage to Ghosts.

Upgrade Info
Lvl...........................................Upgr ade Costs.......................................Time
1................................................. N/A................................................. .N/A
2............................................15000 Dark Elixir...................................3 Days
3............................................40000 Dark Elixir...................................5 Days
4............................................80000 Dark Elixir...................................8 Days
5...........................................130000 Dark Elixir..................................12 Days
Tell me if the upgrade costs or anything above has a problem and you really want to change it.