set booster box mtg Innistrad: Crimson Vow Display All Will Be One explores the plane of New Phyrexia The Lord of the Rings:

If an opponent banishes a character you've brought to the palace, their character gets banished in turn

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Finally, each opponent exiles the top three cards of their library simultaneously

Lastly, while not strictly a set mechanic, theres just a ton of legendary creatures

One thing I learned on this project is that, when working on Universes Beyond sets, you have to trust the "rule of cool." A lot of people were mystified by why there was one meld pair but many people we spoke with who had played FINAL FANTASY XIII thought it was perfect