Ok, so he's specifically cosplaying as Espa Roba from The Sacred Cards. That's an important distinction to make here.
Actually that was the only Yugioh game I played and it was a lot of fun.
The Sacred Cards was weird
Attributes determined battle outcomes in it so the weakest water monster would destroy every pyro card
All you needed to win was to stack your deck with monsters that had attribute advantage over your opponents cards
While the RPG experience was accurate in recreating the Battle City Arc the card game itself, while resembling the TCG,
wasn't
Made for a weird buy messing with expectations, didn't stop me from enjoying the game or anything but I still look back on it like it was some strange dream
Yugioh had a bunch of games
I'd recommend Tag Force outta all of them
While the friendship system is pretty lame the card game was solid