With +5 starting UP and +Ranged attack buffs, I managed to 2* it today using 50CC50 Calliope with CR1/SR1, 50CC60 Cloris, and 50CC50 Pallis. If you need a third witch, use Calliope if you do not use gacha units. You could use Valerie if you do not have Pallis, though I'm not sure if he will deal enough damage without max trust. All my units had max affection.