Reborn into Fantasy Yu-Gi-Oh with the Master Duel Crafting system

I've been reincarnated into the world of Yu-gi-oh... Or not? It's not any of the worlds in the anime, but a weird fantasy world where people fight wars over yugioh cards, WITH yugioh cards. Also, the creatures in the cards kinda exist?? And you can summon them in real life???

That's cool and all, but did I have to be reborn as a slave working in the mines? Well, at least I got the one thing everyone in another world wishes for: A system.

And I have one more advantage this world isn't ready for... Modern Yugioh deckbuilding!