When I play a spell with Fizz Trickster, do I still have to pay the power cost when the spell has, for example, 2 mana and 1 power? Also, if I want to repeat it, would I have to pay an extra 2 mana and 2 power?

To answer your questions about Fizz, Trickster:

1. Do you still have to pay the Power cost?

Yes. As explicitly stated on Fizz, Trickster's card text and confirmed in RiftJudge FAQ #9320, while you ignore the spell's Energy cost, you must still pay its Power cost.

2. If you Repeat the spell, what do you pay?

If the spell you choose from your trash has the Repeat keyword, you can choose to pay the Repeat cost to execute its effects a second time.

According to RiftJudge FAQ #7297 and Rule 820.1.c.1, the Repeat cost is an additional cost paid during the steps of playing the card.

• Regarding the cost: You only pay the specific Repeat cost defined on the spell. You do not pay the original spell's Energy or Power cost again.
• Example: If a spell costs [2] Energy and [1] Power, and has "[Repeat] [2] Energy" (as an example), when playing it via Fizz:
  • You pay [0] Energy (Fizz's effect) and [1] Power (The spell's mandatory Power cost).
  • If you choose to Repeat, you pay the [2] Energy defined by the Repeat cost.
  • You would not pay the original [1] Power again, nor would you pay the original [2] Energy again.

Summary: You pay the original Power cost (because Fizz requires it) plus the specific Repeat cost (if you choose to use it). You do not pay the original Energy cost, and you do not pay a second Power cost for the Repeat.