I have generally had more success raiding against color stacked teams than I have against rainbow teams. If you have 2 reds, and I stack 2 blues, I am now strong against 2 of your heroes.
I would use Kiril as your tank and go Rigard, Caedmon, Kiril, Chao, Scarlett in that order.
Rigard will cleanse any debuffs or DoT, Caedmon will get rid of enemy buffs, Kiril is, well, Kiril, Chao and Scarlett are fast hitters.
Once you get Tibs leveled, you could drop him in for Rigard