Some types, like Goblins and Elves, have an absurdly deep card pool, while others, like the humble Snake, have more of a card puddle
Third, I liked that having a Werewolf (or Werewolves) created a handicap for the Werewolf player, who now couldn't cast more than one spell a turn or the Werewolf would transform back
In addition to the creature cards, there are also several ways to make Horror tokens, including: Reflections of LittjaraReflections of Littjara, Endless EvilEndless Evil, Zellix, Sanity FlayerZellix, Sanity Flayer, Wharf InfiltratorWharf Infiltrator, and UchuulonUchuulon
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The effect is not bad on its own, but potentially highly synergistic depending on the build (both the Treasure token and reverse looting effect)
This may be the most powerful mill card ever printed, and it singlehandedly has made mill a real strategy in Standard