Here are afew combos, (assassin gauntlets = Double strike, jump attack (green)) (warrior scimitar = powerful attack, 4strike (green)) (Mage sword = Poison attack, concecutive strike (green)
Another handy hint in Martial Empires: You can use the same skill on different levels(Cheap Martial Empires Gold). So if you have a level 2 skill, you can use The level 2 skill and then level 1 skill right after. Some cool Skill Crit Combos in here as well.
Uncertain method to skill crit: When you have just finished a normal strike, press one skill, and then immediately tap the second skill. Usually if your timing is right, you can crit it easy.