https://tappedout.net/mtg-decks/budget-beginner-teaching-decks-1-green/
https://tappedout.net/mtg-decks/budget-beginner-teaching-decks-2-red/
^^ the two decks I used, I played green and the ai was red. Still getting the hang of this game but with over like 50k cards in the library and endless combos it's so deep. The AI is quite smart on Forge too. I've never played MTG in my life so this is all new to me.
They introduced a new format (pioneer) that seems to be about the same rotation that standard used to be (~4 most recent sets). I very recently just got back in so I'm still learning about a bunch of the stuff I missed. I think those format changes just happened.