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The effect basically gives the effect of negating a monster's effect for 1 turn whenever you discard or use one of your Kuribohs as a hand trap

If this card is used as material for a Fusion Summon, and sent to the GY or banished: You can add 1 "Gem-Knight" monster from your GY to your hand, except "Gem-Knight Quartz"

If there are 2049 or more Duelists registered for the YCS, then the Top 256 Duelists OR all Duelists with a minimum of 19 Points, whichever number is larger, will advance to Day 2

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As in the anime, you sacrifice a dark monster with only 1,000 attack points or less, allowing you to look at your opponent's hand and destroy all monsters with 1,500 attack points or more