Board Game Arena

I'm hosting a seotda tournament in June. I set the start date two months out because I'm trying to attract as many participants as possible: https://boardgamearena.com/tournament?id=375719

Are you talking about the more modern stylized version of the cards? I don't know if they're currently for sale, but it's this deck here: http://moonrabbithanafuda.weebly.com/original.html

Is there no way to mute sound effects? Every other game on here it's fairly obvious how to do so in the settings, but I don't see it as an option for Hold 'Em.

I don't know, I've had winning streaks (and losing streaks) like that in various games. If it was impossible, BGA wouldn't have an unlockable achievement for winning 10 in a row.

They probably are both very good and *very* lucky, but of course luck's a part of the game.