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Zellix, Sanity Flayer joins Background enchantment Haunted One to command this Horror deck based around milling opponents and generating Horror creature tokens

If you want to play a bit more aggressively and reduce your opponents deck, enchantments that trigger a mill in your opponent with every card drawn, such as the already mentioned cards Sphinxs Tutelage and Psychic Corrosion, fit in well

The given description for Scions & Spellcraft is quite vague, but it seems to suggest a Spellslinger-style deck with accrued card advantage as a focus

Finally, Doctors Companion is another riff on Choose a Background

There are many classics in these colors that are heavily played in Commander and will trigger, like Mulldrifter, Timeless Witness, and Reclamation Sage