here are some good combinations of units made in colony , for use in online multiplayer mode
forge only combination 1
both you and your partner builds forges. one makes phantoms other makes anti air. units cannot defeat this combination easily but missiles can kill phantoms in no time. possibly, best combination for low-tech modes
forge only combination 2
both you and your partner builds forges. one make sakata anti air and other makes sakata spider(ground only) useful for dogfight, since spiders can heal themselves.
long range combination
both you and your partner build outposts, one makes snipers, other makes black queens. since snipers are cheap, they can be made in large numbers. but can be scattered easily by missiles. however missiles can't even scratch black queens.
forge-outpost combination 1
there are many combinations here. however this combination makes use of ground units only, those who can attack both air and ground. one makes goditz and other makes gladiators.
forge-outpost combination 2
one of the best ground combinations here, it combines deadly hover tanks and awesomely armoured anti air. no explanation needed.
ultimate unit combination
most of people say this one is silly, as it involves higher risk than any other combination, however if done perfectly it will wipe of the floor in seconds. missiles are useless against it. as you might know, it revolves around black queens and gladators.
outpost only combination
only combination i could find possible by making outposts only. make hovers and black queens. hovers will rule grounds, black queens will dominate skies.
i hope you found it useful.