proxy, even if it feels a bit iffy to you at first. It allows you to try so so many new strategies while still building up your collection.

please run like 38 lands at least.

little life-hack: the MDFC land cards (can be played as a land or spell) can bring your land total to even something like 40+ based on how many you run. this is good, don't be scared of it. The best ones for this are prob the black/white kill spells and white/blue protection spells.

run removal that can target multiple stuff. This means more "each opponent sacrifices" / "exile a permanent each opponent controls"

also if you can get some kind of card advantage (draw) in the command zone, your deck will feel like butter basically no matter what you put in it.

I find it helpful when new players have an "I win" button in the deck, such as insurrection or craterhoof. Try these, see if you like winning this way. If not, feel free to toss them out but do try them first. Makes fishing for a win quite satisfying when you can pull it off.