Duskmourn marks an increased involvement from Japanese artists in Magic, as it will also be introducing the Japan Showcase alt-art treatments primarily intended for Japan that will be released exclusively through Collector boosters starting with the set
It also helps that it has a long flavor text and intense art style that makes it stand out with the retro border
Check the card back first genuine cards have a deep blue gradient in the Poke Ball area, while fakes use a lighter, flatter shade
Differences in size , weight , color saturation , and print quality become immediately apparent
Probably the most well-known is with Felidar Guardian and Panharmonicon
However, there are so many creature types in Magic that you usually end up with a bunch of different ones without even trying