While you have no cards in your Extra Deck and all monsters you control are Tribute Summoned monsters, your opponent cannot Special Summon monsters from their Extra Deck. If a Tribute Summoned monster you control attacks an opponent's monster, it gains 800 ATK during damage calculation only. Once per turn: You can reduce the Level of 1 monster in your hand that has 2800 ATK and 1000 DEF by 2, until the end of this turn.
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