6 Celestial with Mech Pilots + Jarvan IV Patch 10.18

6 Celestial gives 150% healing so Xayah, Ashe and Robot survive for so long while dealing high dmg.
Jarvan IV adds attack speed to increase dmg of all units. (Every skill and item effects proc faster)
Mech Pilots add tankiness plus extra dmg and with the robot they could be equipped with sword breaker and frozen heart to clip opp. dmg dealers. (Infiltrator's Talons could be used so the Robot attacks opp.'s backline)
Rakan is for knock-ups, Xin Zhao is for sustainability + dmg, Xayah is for Primary dmg and Ashe is for Secondary Dmg
Lulu is Optional if you could get 2 Celestial Orbs

P.S.If you have to choose between having a jarvan or having full mechs choose full mechs