just make what you want.
i mean those m19 set decks are there because m19 is a recent set which means most stores sell stuff from m19.
but sets are generally close in power level.
as long as your not playing the standard format (only the X most recent sets legal in standard) you could use any set you like.
If it's just you two playing kichen table magic, you can play anything. I've gone pretty deep in Pauper (only commons, but from any set) for casual pickup games, but you can really play any sets you want!
(A lot of the time, you'll do best to combine cards with themes, which means sets that care a lot about artifacts tend to work better with each other than with sets focused on, say, Pirate and Dinosaur creatures)
The thing to keep in mind is that you want to make sure you're both on the same page, because even on a budget, if one of you makes a deck of broken cards like Urza Lands, Cloudposts and/or Sol Rings, and the other's playing an M19 Preconstructed Deck, you might not have the best time.
The thing about Pauper is that the power level of that format is actually very high, and if you're unprepared, you can get blown out without realizing it (obviously, casual decks solve this problem, but at that point you may as well play freeform with the Legacy and Modern ban lists). Burn gets most of its most useful Legacy tools, while Tron more or less auto-wins the long game and Affinity can Fling a 21/22 Atog at you out of nowhere.
If you can find them, Duel Decks are usually created to be somewhat balanced against each other, and tend to be good for beginners.
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Quote from Barack Obama »
We're supposed to stand up to bullies, not follow them. We're supposed to stand up to discrimination. And we're sure as heck supposed to stand up clearly and unequivocally to Nazi sympathizers. How hard can that be, saying that Nazis are bad?
Remember, it's impossible to be "neutral" or "apolitical" when it comes to Nazis. Tolerating their behaviour and refusing to speak out in support of their victims only serves to side with the abusers. And capitulating to their disingenuous complaints and demands is nothing but cowardly complicity. So when you cave in to them, you have to ask yourself, "Was it really worth it, to cut off your nose to spite your face? Did you get what you needed, or merely what you thought you wanted?"