LillyTank said:
Those are all really great to know about. Thanks.
Could any of these websites be used to create a PvP experience involving an original card game created solely from scratch or perhaps an existing card game with adapted rules like, say, fan-made Yu-Gi-Oh cards made with Yu-Gi-Oh card maker with hypnosis elements to them?
Yes, I think Lackey allows that.
As for genuine Yugioh experiences, YGOPRO2 is an (admittedly gray area of legality) game that is basically real Yugioh online. However the game ONLY plays yugioh. The other options I listed allow for multiple card games, like MTG, Vanguard, Final Fantasy, etc... I don't know of any places that allow Weiss Schwarz or Buddyfight. I know Pokemon and Dragonball Super have their own sites/clients as well.