Edit: Sounds like the limit is 2 energy per opponent per combat, except in the case of first and double strike, which triggers Pia both damage steps. Thanks Lemmy!
Edit 2: Here's the deck if anyone's interested!
Original question:
I'm a bit confused on her first ability. If 3 artifact creatures did combat damage to a player, would that make 6 energy, or just 2?
It's the "one or more" text that makes me wonder if there is a cap of 2 energy per combat. Hoping not since I want to make an energy commander deck with her.
Note that you can only get two energy per player, but in multiplayer you could make more by hitting multiple people (EG if you hit Bob with 3 guys and Alice with 1, you'd get 2+2=4 total energy)