Choose the missing mechanic
Banxiao prevents qualifying attacks costing one energy or less from damaging itself. Verify that the low-cost attacks you actually use benefit from this protection in Skills.
Luminous Candela can make a Fire skill cost 15% health to permanently add 20 power to Light skills. It fits longer Fire-to-Light rotations and benefits from reliable recovery. Jiaer repeats another choice effect, while Corrupted Jiaer repeats the same effect; every used skill then cools down for one turn, so plan the following action.
Centrifugal Dancer gains 50% magic attack for each different mark on both fields and therefore needs reliable mark creators. Popcorn makes Grass skills add four burn stacks and Fire skills add one parasitic stack; check cleansing and immunity before relying on it.
High-legged Sandpiper gives priority only to the first skill it uses in battle. Dragonfish permanently reduces all skill costs by two each time it enters a charge state. Burrowing Mouse leaves when the round ends at zero energy, so plan the replacement.
Build a three-turn test with energy, cooldown, health cost, marks, and teammate actions. Use the Spirit Index and Compare, test at low investment, and spend scarce materials only when the mechanic reliably fixes a real team problem.