Most local shops pay 40% to 60% of retail value on singles they actually want, and they're paying bulk rates ($3 to $5 per thousand) on everything else
Even the mightiest creatures don't matter if they're stuck in your hand while you don't have enough mana, so don't be afraid to go find the lands you need to power a potent endgame
That said, there should be other threads you'll find, pointing you towards history further back in time, such as this one that has been suggested in the comments
After those, check out the great activated abilities on The One Ring, Strionic Resonator, Steel Overseer, Isochron Scepter, Throne of Eldraine, and Chromatic Orrery
Id imagine that this is too slow for aggro decks, and midrange/control decks would rather run finishers that are better top decks