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When it enters, you choose a creature type, hint: choose Turtle, and it doubles every triggered ability of your creatures of that type

C Common Dark Contract with the Swamp King X SPELL Continuous During your Main Phase: You can Fusion Summon 1 Fiend Fusion Monster from your Extra Deck, using monsters from your hand or field as material

Lost Vacuum allows you to discard a Tool or Stadium in play, which can stall your opponent for at least a turn depending on their decks dependence on such cards

This is the first Arkham game that I learned by reading the rules, rather than having it taught to me by an experienced player, and I found that worked quite well