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The rat kings inherent graveyard hate is supplemented by, again, Agathas Soul Cauldron, and we can also see The End being trialed as an answer to one-trick Atraxa decks

Laboratory Maniac FINAL FANTASY: Through the Ages, Uncommon Limited: 1.0 Youd have to be a maniac to try and get Vanadiel Adventurers (Laboratory Maniac) to work in most decks, it is possible that blue/black will want it from time to time (or green/black can splash it with enough graveyard synergies)

I also considered adding the rarely seen Shared Discovery to this list, because now that Treasure Cruise is banned in MTGO pauper, shared discover is the only straight "draw three" card left in pauper

Rise of the Salamangreat works like a typical Ritual Spell for the most part allowing you to Ritual Summon a Salamangreat Ritual Monster using monsters you control or in your hand to Ritual Summon it, but it can also let you banish Salamangreat Link Monsters if you control a FIRE Link Monster