I got to 120+ with this team, Shayne And Aurox, Kleese, Rath, Montana and Reyna.
Shayne and Aurox - 20% upgrade, -20% - Crit damage/Ability Power (crit better, but quite rare to get)
Kleese -20% upgrade -20% upgrade -5%ability cooldown - Ability power rest of the time
Rath -20% upgrade -20% upgrade, -Crit damage rest of the time
Montana -20% upgrade Cost -20% upgrade cost, Crit Chance for the rest.
Reyna -20%upgrade cost, -20% upgrade Cost, Crit Chance for the rest.
The -upgrade cost only works if you have the Fragment of Valor at max level, the ability cooldown on Kleese makes it so Reynas and Kleeses ultimates have the same cooldown
Celerity Capsule artifact helps as well.
These are done with many of my characters only at blue and purple gear so far but i get to 120+ fairly quick.
Caldarius is also quite good if you go full crit damage on him.