standard card sleeve size USA Chimera Sleeves (56x87mm) yes they do and they are all about protection Sleeve Size Chart : r/mtg

So what other cards can you find in the Maze of Millennia set

Our proxy can be use for kitchen table magic, proxy for deck testing, act as additional copies of those expensive cards that you already own, players who looking for alter art of a card that they like or to use as their Commander, cube, EDH / CEDH games with friends who welcome proxies

And if you get the foil version, you'll even have a decent artificial recreation of what those sunbeams might look like

These can be simple one-card effects that are often misplayed or extremely specific combos requiring a ridiculous amount of setup that youll rarely see in-game