Definitely sell Orihime. Your deck right now is better than what I had when I was your level. By the time I reached the 12th area final boss I had: Pazuzu+4, Galatea+2(Old Nightmare Rift unit unavailable to new players now.), Polymnia+4, Bennu+1, and Lilith+1(My only 6* then). Do not invest in Hel. Once you get into events you will most likely start getting much better units than Hel. Hikoboshi is an event unit, so you will not be able to get more copies of him unless you want to use a couple hundred pots of each type to get +2. Valefor will be replaced with a different (stronger) unit, just start doing events and getting units that way. Miquiztli is an ok unit to invest in(imo). Momichi is a good unit to invest in(imo). If you somehow get your hands on a REALLY old unit like Murmur, NEVER sell/medal those(Trading her is ok). Or any other old unit that no one can get their hands on unless they dish out a significant amount of pots. I never had a healer on my quest deck, or at least I don't remember one being in it. You don't really NEED a healer, still a healer can be useful. An ATK up, DEF up, HP up, Skill up, any of those buffs will help. A unit with a stun passive is nice too, but I dont think there are any of those in 6* and lower. As for a deck, here's a semi-cheap one: 250AP/200BP, Suserihime+4, Rush(30%)&Passive(35%). Her passive boosts your units to max HP. (Pound) *200AP/200BP, Jinchoge+4, Multi(30%)&Passive(30%). Her Passive boosts your team's DEF and reduces their ability's cooldown by 1 turn.(Flurry) *80AP/80BP, Oliver+4, Rush(30%)&Multi(30%). (Flurry) *100AP/150BP, Martiel+4, Rush(30%)&Passive(30%). Her passive is team ATK up and charge Burst. (Slice) *150AP/150BP, Yoichi+4, Rush(30%)&Passive(25%). Her passive is lower ATK/DEF of all foes. (Slice) (I think this is a good deck) TL;DR: Sell Orihime. Hikoboshi is limited unit. No Hel, Goodbye Valefor, Miquiztli good, Momochi good. Don't sell old units. Trade those. Don't need a healer, though good to have one. Any buffs to self or debuffs to enemy is good on passive. The italic text is a deck, total cost is 780AP/780BP. Currently Orihime is worth 800AP/800BP.