Greetings Timespiraled,
These cards are totally homemade based on "Magics Card" style and each color-typed card are just the same template with different color shades.
To be honest, I didn't even know how Yu-Gi Oh! cards looked like so I browsed the web to find it out and yeah, I do understand why both of you guys thought these were Yu-Gi Oh! cards... but rest assured that it's really 100% homemade with Photoshop. :)