I’ve just recently found out about this game and played against someone online with rare cards. Looked at the shop and got no information on how to get the currency, looked it up on google and saw a single post on reddit even mentioning gold in ygo omega with no comments. So how do you get gold?
You get DP (Duel Points) for winning ranked matches against someone who is ranked Silver or higher if I’m not wrong. You can also get DP from Dorms in Discord. Lastly, you could donate to the team for the server maintenance cost in exchange for 1 of each rarity (this is the only way to get it through real money and you can only get this once, though more donations are welcomed).