TL; DR: how do I start building a collection cheaply with versatile/staple cards?

A couple of friends have started playing Magic: The Gathering with a virtual tabletop, and while I have learned a lot from playing Arena and reading cards (and watching the Prof) there's just something not working for me in the digital space; Archidekt is tough for me to read through, and even something like Tabletop Simulator doesn't work for me for learning the game (or rather...it's not sticking). I know that I do pretty well with physical objects, so I wanted to get some physical cards to get the hang of the game but immediately ran up against the cost.
I don't know if you guys know this, but Magic: The Gathering is expensive. Way more expensive than I can justify for a hobby I've just started and haven't really gotten the hang of. My question is: how do I start building a collection without breaking the bank?

The things I know, but might need to be corrected on:
"Don't buy bulk"; apparently most boxes of bulk have a bunch of repeats and are generally the cards left over when the good ones have been extracted. I would love to be wrong about this, because even getting common/uncommon cards in enough volume to play in a physical space would be neat.
"Buy singles"; it seems like this is a good way to spend $50-$1000 blindly in the dark if you don't know what you're doing.
"Play what you enjoy"; I've played some jump-start decks and those are neat, but I haven't played enough to know what I like, making this difficult. I also haven't played enough to know the difference between what I enjoy because it's neat and what I enjoy because I won with it one time.
"Buy a precon deck"; from what I've read the commander precons would be a good way to get a lot of single cards, but I've read/heard mixed things about them: reviewers discussing how to "fix" them to be good.
"Buy jump start packs"; I would love to grab a bunch of the jump start decks to mess around with and find synergies, but how do you avoid getting repeats of the packs?
"Buy the Foundations Starter Collection"; Foundations Starter Collection is apparently sold out (or only being sold used/resold at a higher price?), but seems exactly what I'm looking for: a decent collection of classic/useful cards that you can build with and supplement as you learn the game.
"Look for garage sales or ebay for collections"; I'm pretty sure my chances of edging out an experienced card hunter on a good deal is slim to none, especially in my area.

I would, in an ideal world, like to have a small collection with 300-500 of the cards that "everybody knows" for kitchen table Magic (fake draft/jump start, casual commander, casual...modern?), but this seems out of reach. Any guidance would be appreciated!

There are two relevant articles, both of which provide insight into why these changes were made.; they are relatively lengthy, but I have provided summaries of the changes.

Commander Banned and Restricted Announcement – April 22, 2025

Summary: 5 cards have been unbanned and are now on the game changers list

• Gifts Ungiven
• Sway of the Stars
• Braids, Cabal Minion
• Coalition Victory
• Panoptic Mirror

Commander Brackets Beta Update – April 22, 2025

Summary: no major changes to the mechanics of how brackets function. Two cards have been removed from the game changers list and 18 cards have been added.

• Trouble in Pairs removed
• Trinisphere removed

The following cards have been added to the game changer list: Teferi's Protection, Humility, Narset, Parter of Veils, Intuition, Consecrated Sphinx, Necropotence, Orcish Bowmasters, Notion Thief, Deflecting Swat, Gamble, Worldly Tutor, Crop Rotation, Seedborn Muse, Natural Order, Food Chain, Aura Shards, Field of the Dead, Mishra's Workshop

Hey there! I posted this on r/magictcg a while back, but I've seen and received many new ideas for cards and I'd love to see if you have any new ones.

I had my Japanese copy of Sliver Queen in my wallet for years because my friend found it for $2 in a bargain bin, and I thought I could just buy another - not knowing it was Reserve List. Whoops. So I decided to build an Illegal Slivers EDH deck where every card is somehow not quite legitimate, with a few restrictions - no power 9, no OG duals, and if I can help it try to make as much variety between restrictions as possible, all while trying to keep it as a legitimate deck that aims to use Queen as the wincon. But I'm only about a quarter of the way there. Here's what's up:

• Cards from other games with the same or similar names are used; Swamp from Wyvern, Island from Dominion, Ancient Tomb from Pokemon, Xiahou Dun the One-eyed from Wixoss, Karoo from One Piece, Duel Masters copy of Muscle Sliver...

• I'm using relevant illegal MtG prints - World Championship decks, Mystery Booster playtests, an art copy of the Unearth Sliver I keep forgetting the name of, silver borders / acorns, etc. Also Clickslither (from Legions!) instead of Quick Sliver (from Legions!).

• I was looking for a Wheel of Fortune tarot card before I found that lööps sticker and decided to go with that.

• My favorite is that someone originally stole the shipment of Crystalline Sliver promos before they were going to give them out... So if you had a copy of it at one point, it was literally-illegal stolen goods. Eventually they retrieved them and distributed them.

I've got other ideas, and I'm trying to break each rule. Looking for:

• The best single thing from the ban list

• Lutri as companion, or one card used twice

• One ante card

• Planechase and Conspiracy

• The card Unquenchable Fury, to be confused with Unquenchable Fury

• A 30th Anniversary card

• Some oversize cards as regular-size proxies

• An AI generated Sliver as a proxy

• Some configuration of Unfinity Stickers to make a new Sliver card of my own

• A World's Smallest for something like a Night's Whisper

• An Armageddon trading card for Armageddon, a Hearthstone from WoW TCG, a Force of Will from L5R TCG, a whole bevy of cards from LotR card game... I still also need Sliv-Mizzet.

And once this is all done... Find 100 different card sleeves to wrap these in. I'd also love - LOVE - to get the Queen graded and still use it as my Commander.

So, Tildes - how else can I make this deck even worse? Thanks!

War of the Spark is the next MtG set, coming out on May 3.

They released an official trailer today: https://www.youtube.com/watch?v=b5W9t62t10I

As of the time of posting, there are 32 cards revealed so far, available here: https://scryfall.com/sets/war?order=spoiled&as=grid

They previously revealed that every booster pack will have a Planeswalker in it, so the set looks like it will have quite a few of these unusual Planeswalkers with no way to add loyalty counters to themselves.