@NuggleTheKelpie Also, there are plenty of youtubers out there who design decks that you can copy. A few that I've followed at one point are Merchant, Noxious, MONO BLACK MAGIC (my go to for interesting decks). There are also sites that people upload their decks:
mtgarena.pro,
mtggoldfish.com,
aetherhub.com,
mtgadecks.net, etc.