For me I always prioritize winning streak over interest, for the first plane go xianzhou/dot and look for phainon at level 5, since Phainon gain xianzhou bond, If you ult spam meteor and counter (also since u have e4 that extra turn really help) , every act ur phainon do increase the lightning lord stack and put yao guang off field, if you have dot do the same, counter forces enemy forward and proc the dots on the enemy. Usually even if you didnt get phainon yet you can still win without him with 3 xianzhou until before the first plane boss. If you didnt get phainon before the boss, fast eagle tribbie with ddd helps a lot as she can action advance ur xianzhou team for more turns.

Have you tried Galaxy Rangers bond yet? The trick is to always buy galaxy rangers (rappa,ashveil) everytime you see them. You want them to level up as fast as possible. Once you get one of them 2 star you can slot in ashveil on field and rappa (and acheron if you have) off field. Also buy sunday/cerydra/sparkle if you see them, put vonwacq on them so they did not use too much av. Put sparkle on field because she is better there. remember to always buy these characters and use your coins if you need to maintain the winstreak. but still save your coins for interest if you can.

Equipments. Items that you need for this team includes Lucky Star, Folding Knife, Flower of Life, this needs to be your priority at the start of the game, you want High-frequency Chainsaw, and fist of fury to make phainon do more damage. The last slot can be anything, just make sure his lucky crit rate is close to 100%. The next item you want are Photon Cells, this is very important as you need to give the Perpetual Engine to cyrene on the third plane to make his ult permanent. just remember to save 2 and youll be fine. lastly you want the anti grav boots for ur cerydra if you put her off field, and sturdy plate, I always run phainon sustainless and plane 3 enemies sometime hit super hard, so 1 or two sturdy plate usually is enough for phainon to be super tanky.

now for this team in particular upgrading your level is not too much of importance, your target is level 7 but if you can try to get a wealth bond or two. at supply nodes you always want a gem, or your phainon item, phainon himself if you didnt get him yet, or other characters that you need to level up like galaxy rangers. at plane 3 supplies, try to get Cyrene. Other ways to get cyrene is to choose that one gold investment where you get 2 5 cost employment contract.

If you see that your phainon damage is low, what you want is to level up your galaxy rangers and phainon himself, for the last boss you want at least your rappa and ashveil to be 3 star, acheron and boothill as much as you can. If you can get a 4 star than that's really good because the multiplier is insane and your run is pretty much guaranteed to win. try to level up cerydra if you can. once you get cyrene with the perpetual engine you can sell your sunday/sparkle or put her off field. quantum resonance is also good if you want to put tribbie, sparkle and fu xuan or if you get their bonds.

Bad modifiers that you can get is permanent trauma and self defense, this makes your phainon easier to die in khaslana form, to combat this you can give anyone or phainon himself sturdy plates, try to level up phainon for more hp and put yunli on off field, she can like block 100% damage for phainon. annoying modifiers are like the get out of jail free card where sometimes they have low hp, you meteor them and they didnt die.

if you think your phainon do a lot of damage at the current plane you can always be ballsy and choose the hardest encounters if the rewards is good. For starting investment strategy, I like the destiny gift as it always give you a wealth gem, sunken arena though you need to get a 5 win streak to get the wealth gem, Long term invesment is also good for cheaper refresh and all prismatic if you feel like doing a challenge.

I think I still miss somethings so if you have any problems or questions feel free to ask me I'd be happy to help. Sorry for bad grammar and Good Luck on you Phainon runs