With expensive legacy cards, people usually complain[cards] about proxies if there's more than 4 of them. But, I still think it would be worthwhile to test legacy decks before buying cards. I tried out virtual playtable, it wasn't impressive to me since it was very slow and glitchy, and it seems like there's no tech support for it. It would be nice to avoid wasting my time again, so are there any good websites or software for testing decks?
Tooth and Nail
8 Rack
Mono Red Storm
Elves
R/G Tron
Cockatrice - https://cockatrice.github.io/
Untap.in - https://untap.in/