Adding cards for single-player use?

Total noob question here, but I re-discovered Shandalar recently and was trying to rebuild an old deck I used to have in real life. The only card that is missing is Tinder Wall, so I was wondering if there's a way to replace, for example, Wall of Wood for it. (It's pretty much the same card but with extra synergy for red, I figure it wouldn't need special programming to add?)
I don't quite care if it renders the game unusable for online use, I am fairly happy just battling the AI and grinding for cards.
I'd also like to know how to tell which version I am using. I found a download link in the description of a youtube video (a Mega link, not sure if it's allowed to post it here), but I can't quite tell which version or last update this is using. Is there a way to know? Can I move my current save to a newer version if it's not up-to-date?
I don't quite care if it renders the game unusable for online use, I am fairly happy just battling the AI and grinding for cards.
I'd also like to know how to tell which version I am using. I found a download link in the description of a youtube video (a Mega link, not sure if it's allowed to post it here), but I can't quite tell which version or last update this is using. Is there a way to know? Can I move my current save to a newer version if it's not up-to-date?