Vault Door/ The Location Package Vault Door is another high-impact item, but unlike Sumerian Talisman, it relies on a few specific cards in order to reach its full potential
Bloodbraid Challenger WotC has this habit of calling up notorious cards, however, the cost to do so oftentimes includes significant tweaks
Some, like Huntmaster of the Fells started becoming popular in the Jund builds that emerged after the banning of Treasure Cruise and Birthing Pod in February, but as there were not a single major Modern event until last weekends StarCityGames Invitational, his price stayed low for months and only spiked this week when the wolf is out of the bag
If each crossover received its own supplemental set la Battle for Baldurs Gate or The Lord of the Rings: Tales of Middle-Earth, people would be far more likely to have these cards and want to use them
In addition in comses with a 10/10 body, Flying and protection from white and from black, so with Haste it can be a finisher
Scryfall and other databases list legality for every card, so you can verify before buying
