For inspiration, we looked to the Monoists, a black hole-worshipping organization that Worldbuilding had created
Mufasa Champion of the Pride Lands Good luck getting through this Mufasas ten will power
The power of Umezawa's Jitte is that it destroys creature decks, and while it might be a bit slow for Modern, it would still push certain decks (like Elves and perhaps even some Collected Company builds) out of the format
Note that these Lurking Evil cards have a different collector number from the regular versions, but you might not notice straight away if just glancing at the cards
Vault 13 really isn't that interesting a Vault, it was designed to have its water chip fail and wasn't issued replacements and that's it, so leaning on the broad strokes of the story of Fallout 1 is a pretty decent angle to lean on
If youre running werewolves you probably want some instant-speed effects to allow you to skip casting spells on your turn but still spend mana on your opponents