Which monster do you like the most in Heroes 5 at level 7?

I like the green dragons and their upgrades because they are the fastest of the 7 types! And the crystal dragons are super; they can attack 5 times at once! If they aren't very strong and don't kill many, you can use them to block someone, for example, by standing in front of the riders. Or, you can use the emerald dragons to break through the first row and attack the archers. These dragons can be used in many ways!