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A good example of this paradigm is Hollow One, a card which really helps red-based discard decks without taking a red slot

That being said, this card is a auto-include in a Dragon Tribal deck

Untap effects like Thousand-Year Elixir, Seedborn Muse, and Tyvar, Jubilant Brawler turn the Night Witch into an engine by letting you activate it multiple times a turn cycle, plus all that sacrificing pairs well with Midnight Reaper

Looter il-Kor A bit weaker than some of the other cards here as a discard outlet for being slow and giving your opponents time to react

Whether its creatures like Cass, Hand of Vengeance or other auras like Mantle of the Ancients, this deck has ways of avoiding getting completely blown out by one removal spell