Into the Pit | Illustration by Greg Staples Duskmourn: House of Horror is a Standard Magic set flavorfully based on modern-day horror. The world-building is actually quite expansive, more than Ive seen for most traditional sets, and kind of splits into two elements
This is the most classic Aggro deck in the format it can lock out games blisteringly fast, but if your opponent can stabilize or if you stumble and run out of threats, it can be hard to recover
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Since these decks almost always have access to white, Cloud certainly shouldnt struggle to find a home
Just bear in mind that the initial casting of Chimil itself can be counted, shutting you down if you arent wary of removal
Although its unclear what exact function Roshan, Hidden Magister will have overall, it does seem to be particularly good in a disguise/morph build in an assassins deck so you can get assassin attacking triggers for those face-down creatures