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Whenever a Horror you control deals combat damage to a player, that player mills that many cards

As far as Commander goes, I think that Nature's Rhythm is a very playable card but will probably be a backup to Finale of Devastation since, in Commander, it's pretty easy for a green deck to make enough mana that Finale not only tutors up a creature but also Craterhoof Behemoths up the team for lethal

You can use proliferation and other counter synergies

The team working the case expands as Kaya (and her skills with spirits) and Kellan (continuing from his adventures across Eldraine and Ixalan) join Proft to solve the plane-wide mystery