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However, what we can do is look at heavily played Standard cards, and see when (or even if) their impending rotation caused people to sell on a card

Horror and Room are subtypes, not card types

Perhaps not

Unfortunately, the deck does not have access to a creature-land, but for an investment of only two mana, I would say Advocate easily pulls its weight, even though it doesnt ramp directly

(However, if it's still in the graveyard at that time, it will count itself, as it is very much a hot card.) If another effect modifies how much damage your hot source would deal, including preventing some of it, the player being dealt damage or the controller of the permanent being dealt damage chooses an order in which to apply those effects