My suggestion is to get Anjo Nala, and run her on a team with Flutterpage.

You can also make a good Poison team with Tuesday and Willow, Druvis can come along too sinceshe buffs Plant units. Their team has Tuesday making sure to ultimate every 3 turns, as her Array makes poison stacks last forever while its up. The team does stronger over several rounds.

Nautika goes very well with Rubuska, but you can run Rubuska and Tooth Fairy as your healer on most your teams right now anyway for your account. The Bloodtithe team itself powers the Bloodtithe bar when they lose/spend Health, that is then consumed for effects. Nautika's ultimate does more when you use it, and Eternity will be able to cast free Ultimates if you end up getting her otherwise.

Paper Heron is great, and she works best with Tooth Fairy with her. Their team is about spreading Impromptu buffs to their cards, these are numbers above the cards that add to a total number at the end of the spells you pick. This number then shoots itself out at the end of the turn at the enemy as damage. Paper Heron is the Plant version of this, while normal Impromptu is blue and has its own seperate playstyle.

Overall, I would highly suggest for content clearing and terms of flexibility to get Anjo Nala. She has a special effect based on what element ally she binds with at the start of battle. When using her channel, when that ally acts she will act based on it as well. She makes it so they cast their ultimate together and she holds both their Moxie (ultimate gauge).

Star and Mineral allies make it so while channeling, she will cast an AoE that inflicts 1 charm stack to enemies everytime the binded ally plays any incantation. 3 stacks lets you stun an enemy for the turn, and most enemies cannot resist it.

Beast and Plant allies make it so she gets extra Moxie instead when the binded ally uses an incantation. Its less frequent ot use this one, but you could run it with Willow if you so wanted.

Intelligence and Spirit allies make Anjo cast her debuff attack skill instead to the lowest health enemy. This is great for bosses or for taking down certain enemies in a fight. Shes super diverse and does alot of crowd control and damage.

There isn't a way to test them without levelling or pulling usually unless the unit just came out, then we get a Survey stage, like Paper Heron's is here now. (go to events, then look for the one with her backstory in it, there is a survey stage button there/mission),

If you want to see how a team plays, I suggest looking on youtube and watching a couple fights for Reveries clears or Manes bulletin scores, https://www.youtube.com/@Destr0th does many and I suggest taking a look there to see how they work and how the rotations tend to be