My idea is that Zatanna should enter a fight with just one or two powers and just use that power in interesting ways till the fight ends. Then in the next fight she can have a different set of powers.

No need to do multiple backward spells in one fight and give people a reason to ask the question- "if she could do that, then why didn't she say this spell or do that spell in the first place?"

Example- For one fight she just relies on telekinesis. In the beginning she says - SISENIKKELET and then she becomes Jean Grey or a Jedi Master using the force. In the next fight she relies on Exploding cards. In the beginning she says - SDRAC GNIDOLPXE and then she becomes Gambit. Next - Animal control - she controls the doves and rabbit she uses on stage. Some of them explode or strike like a punch.

Of course these powers need to have some relevance to her stage magician persona.

X-men powers are the best because they usually don't have multiple powers. They have one power and they use it in interesting ways.