GU is probably more of a time investment than SL given that you can't rent cards right away. This means if you're interested in playing, I'd strongly recommend reading posts from the community, watching a few streams, checking the subreddit, etc. (in your free time) to become familiar with how things work.
Also, if you do get started and begin posting about it, feel free to give me a ping! I'll be sure to swing by in case you need anything :)