Air
Step 1
Build 2 Banks
Build an Armory and set it as Energy
Build a Forge
Once you have done that...
Step 2
Upgrade the Forge to the second upgradable thing.
Upgrade both banks
Step 3
Then get 4 sakatas and hold them.
After you did that, you should have enough of everything to get unlimited Phantoms.
You might want to get some Scouts in there as well.
If it ends up not working it is probably because your partner sucks.
If my Walkthrough worked good please comment this and tell me too make a ground Walkthrough.