Conquest

the rebel modifier, watching Sabine or Ezra take turn after turn until they kill a toon,

There are teams that are immune to crits. Hux and JMK provide their respective squads crit immunity.

And inquisitors with Reva lead + Amplify Agony + VA will allow you to beat almost anything easily. (The enemy gains 6 purge before anyone mores, which applies 6xAA damage while everyone is still at 0 TM. Then VA applies at least 12 dots (2 per purge) causing 12xAA damage. Even if you don't have an extra AA disk or a Blue VA disk and that's where the cycle ends, some of the enemy will be out of protection and into health damage. (The way I play it with 2xAA disks you usually have some of the enemy with only 1 health left before anyone moves.) Then GrandInq gets a bonus turn and uses his AoE. 7S can then heal and grant Crit Immunity if you have Ruthless Swiftness and if any enemies are left alive.

There are probably others I'm not thinking about just now, but between FO, JMK, and Reva-Inqs you have enough options that you can focus on one and have it ready for next conquest.

Oh, and Rey as well. She doesn't provide crit immunity, but the provides damage immunity when you hit yellow health, so people can get knocked low before you move, but they can't die before you move.

There are probably a bunch of other solutions people have come across, but those have all worked for me.

As for 20 wins with Phoenix, yeah, that's not terribly easy without Captain Rex, but he's required in the squad anyway, and if you have the kyros to get him up to g10 or so, and if you can get the VA + AA + RS combo going, you only need one fast Phoenix toon to obliterate the Sector1 DC node before BB gets a turn. The g10 is just for insurance, but also adds some speed to him from certain gear pieces.