My current team setup.
Guardiron and angelon could easily be upgraded so thats not a problem. Just angelon is a copy of 2 others i use and guardiron doesnt seem good skillwise
upgrade guardiron and angelon, they have stunning entrance and guardiron have timestrike
first line: heavenswyrm, guardiron (evolve it), ultimadragon and geartyrant
second line: angelon (evolve it), timberlord, kamishogun and solariel
third line: komalion (evolve it), revan (evolve it), shadowhunter and deucalon (evolve it)
fourth line: lunadrake (evolve it), nebelronix and prismaryx
cost 183/183
explaining
heavenswyrm, ultimadragon and geartyrant: stun flash
guardiron and kamishogun: timestrike
angelon, komalion and solariel: stunning entrance
revan, shadowhunter, lunadrake and deucalon: sleep combo and death sentence
nebelronix and timberlord: death revenge and payback revenge
prismaryx: dual slayerbane
(PS: prismaryx is at the end of the team because of his dual slayerbane)
I hope this helps you 