Hey Kalwar,
Whilst the playing cards assets are free to use I'd greatly appreciate a mention in the final release and/or a small donation would be greatly appreciated but that's entirely optional.
Thanks,
CaptainLaptop
Viewing post in High Resolution Playing Cards comments
Sure, will gladly do that!
Without a license allowing commercial use I'd shy away of using this though. "it's free" is not a legal permission to do so (or at least not very reliable).
I'd suggest adding a "CC BY 4.0" license for example (https://chooser-beta.creativecommons.org/ gives you some options, pick what fits you), so others don't have to worry about potential legal issues when using this.