Any recommendations on which demacia champion to beat the 6.5 star elder dragon adventures?

I'm having a hard time on the quest, I beat ED with Morgana last update so I can't using her again, and I have no idea how to beat ED with the other demacia champions, I tried both Lux several times, but getting overwhelmed because she can't handle too much enemy, Garen and Vayne's unit are too weak to counter the enemies' attack.