Best tactic for using a hero with the comet ability =
In the beginning of each battle, wait till you can use it, then fire it upon the enemy hero, the hero will now charge towards you. Just wait till he reaches your castle, and now click 'forward' so all your units attack the hero, usually this ends up in the enemy hero being dead in a couple seconds... +1 if it worked for you :D
 "Epic War 3"){kind=icon}
 "Raze 3"){kind=icon}
 "Stick War 2"){kind=icon}
 "Raze 2"){kind=icon}