Board Game Arena

I am new to Fluxx on arena. I am aware that the base game has several different editions and I was wondering which edition is used here so I can study the deck. I've played several different editions of the paper version but some cards (especially goals) here are new to me.

Thanks in advance.

It's 5.0

I was introduced to the game with version 3.0, more than 20 years ago. I'd never seen this deck before either. Took a little bit of adjusting.

At what point did basic Fluxx get bogged down with all these new rules cards?
I played 2.0 a lot back in 2000/2001, and it was a much faster paced game.
It would be nice if there was an option to play an earlier edition.