What would it take to add support for additional TCGs like Epic TCG (card database) and The Spoils (card database)?

Hi, and welcome

Well... it would take a bit of work for the initial import. More of a problem right now is that all tcgs take work to keep up to date with new releases, find spoilers, sources for prices, card scans and images, etc.

I'm not saying no to your request, and I've taken note, but it will take some time... as we'd like to finish the important promised features for the currently supported games first.

Thankfully, Epic and Spoils aren't MTG sized yet. I'd need a bigger office.