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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)

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

However, some don't care and can trample their opponents

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