For mtg I made a commander deck specifically for teaching new players. Put a lot of work into making it approachable, lots of options with clear cause/effect, and a few lucky cards that can pull a win out of nowhere against better decks. It doesn’t have consistency but especially when people aren’t paying attention to the new player it can give some satisfying wins to help keep the newbie excited. People forget that you need someone to be excited or they’re not going to want to play again and you’ve just burnt a future shared interest