Another thing worth noting is that all the decks have cards using the new D20 mechanic
Primarily both are played as a two drop that draws a card, the elf is just a body to be done away with via Skullclamps etc or offer up synergy for better elves where as the wall is more of a speedbump against aggressive decks
Once they understand that youre on their team and want them to have fun itll be a lot easier to land on (and explain) household rules around appropriate video games
The last judge promos printed were the cycle of Owl Basics in 2023, which were universally panned for being low-effort judge promos
Most of them merely require to you have both halves in play, like Brisela, but others may require both halves to attack (like Mishra, Claimed by Gix), or have a certain amount of cards in your graveyard (like Titania, Voice of Gaea)
OP04-040-queen-454 is a rogue fan-favorite leader with a uniquely cool effect that blends Yellow's healing flavor with Blue's card draw quite nicely