: His thoughts rising to places they should never go.

Imagining what it would be like.

To have more, and more, and more power."

are the comma's correct here?



I think it depends on whether you are trying to make a dramatic effect - and then it depends on what sentences follow. The reader is being asked to pause each time and they may not like that if there's no finish that justifies it

- To want more, and more, and more power. But suddenly, he was falling, plummeting, from unimaginable height. His enemies stood and watched as he hit the ground.

That's ok. But if you aren't building a dramatic effect, I'd leave the commas out

- To want more and more and more power

That is correct and, I'd say, better in a more ordinary context