The fact that they can all be played for so little mana allows for their controller to have protection and/or backup if any card is removed
Even if Ketramose, the New Dawn doesnt see Modern play, any deck that can exile cards somewhat frequently will want this card
A single Viscera Seer trigger isnt much to be happy about but it quickly becomes too much for your opponents to handle when you draw a card, make a Clue token, deal a bunch of damage, and gain life thanks to something simple like a Zulaport Cutthroat
Finally, the deck features removal spells like Despark, Hero's Downfall, and Swords to Plowshares, as well as enchantments like Planar Disruption and Sinister Possession that can disrupt your opponent's strategies and remove troublesome threats
We wrote a whole article that covers everything here, but in summary: October Booster packs re stock in North America for LGS