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Each "Danger!" monster is based on a cryptid creature:
Their effects resolve around discarding. Each "Danger!" monster has an effect that reveals itself in your hand and causes the opponent to randomly discard a card from your hand. If the discarded card is not the revealed monster, it is Special Summoned and you draw a card. Each "Danger!" monster also has an additional effect upon being discarded, ranging from destroying cards ("Bigfoot!"), or Special Summoning more "Danger!" monsters ("Jackalope?" and "Chupacabra!"). This combination effectively turns the card that your opponent randomly discards into further advantage.