The great filter.
RD/KP15-JP033 絶望狂魔デッド・エンド Zetsubou Kyouma Dead End (Dead End the Mad Fiend of Despair)
Level 8 DARK Fiend Effect Monster
[REQUIREMENT] Shuffle 4 monsters from your GY back into the Deck.
[EFFECT] Choose 1 face-up Level 8 or lower monster your opponent controls and destroy it, then, if there are 6 or more monsters with the same Attribute in your GY, you can choose 1 Level 7 or lower monster in your opponent’s GY and Special Summon it to your field face-up.