Hey guys, could you give me some suggestions as to who to pick up with my 6* exchange ticket? I have as follows:

Magic: Dogwood, Nerine, Lycoris, Apple (Tanabata), Cattelya, Apricot, Helenium (Easter)
Hit: Alstroe Marie (lol), Flowering Peach, Viola,
Pierce: Saffron, Curcuma
Slice: Black Baccara, Habranthus, Dusty Miller, Aizoon Stonecrop, Nightmaher

I've had my eye on Kerria for a LONG time. Cattelya (Idol) looks amazing but I've already got a lot of magic, so I don't know how important balance is. Easter Cactus' ability looks amazing to revive but I heard it was bugged? Any advice on who I should pick, or if I should look at a completely different 6* instead? I'm looking to build as strong of a team as possible, so I'm not as worried about waifu-ness, although it is a bonus and a potential tiebreaker!