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.
get into Pauper then. Commons only, top tier competitive decks are usually less than $100, and that's assuming you even want to get competitive.
Pauper is cool but a lot of the interesting card interactions for me start at uncommon and above
I play mono red so any card with more than 8 words of rules text is bullshit to me