You see... I am the opposite. I don't combine casts. If I were to just pickup invisibility from protector and go down warlord every game, I would be unstoppable. Instead, I make dumb restrictions, like:

Buy every trainer I see, regardless of how much it screws me over sometimes.
Instead of a normal tree, I have crop burst, Invoke Berkana, decoy, time reversal, and word of love in a one pawn colony. An orbital trader took my prospect recruit three times >.>'

Roll D20: You get that tree next.
Genie is a warlord frostshaper. I guess.

The Storm is coming.
Only Staticlords. Yes, chain lightning IS hilarious.

Minmaxing a bit:
But warlord + invisibility with levels in upgrades is pretty unstoppable. Grab a secondary tree after you can defend your value, is my colonist policy.
Normally would do this by my second psycaster being a technomancer + warlord, giving a ring of craft psyring to first psycaster protector + warlord, and they make invisibility for everyone. Then a empath + warlord so drones don't break the colony.

At that point every colonist is an untargetable killing machine. Raids are a joke as they don't even try to shoot at you. It's funny to watch, though.