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During Boomer's duel with Crow, upon summoning his Earthbound Immortal, he discovered that the souls of everyone from his village was inside it, making him realize that his village's destruction wasn't caused by the Momentum accident, but by the Earthbound Immortals, meaning that everything that had lead to him becoming a Dark Signer was manipulated by the beings he now served

Why, however, cant it negate cards that are special summoned by effects

You can't send Blue-Eyes Ultimate Dragon for Dragon Master Knight, but you can send Black Luster Soldier since Ritual Monsters are found in the Main Deck)

for the rest of this turn, all monsters your opponent controls lose 1000 ATK, also your opponent cannot activate cards or effects

The Quick-Play Spell card De-Fusion saw its debut in this booster, which still sees play in many modern decks that rely heavily on Fusion Summoning

Apprentice Illusion Magician X DARK Level 6 [ SpellcasterEffect ] ATK 2000 DEF 1700 You can Special Summon this card (from your hand) by discarding 1 card