Elemental Hero Aqua Neos [POTD-EN031] Ultimate Rare Sea Serpent your opponent cannot activate cards

your opponent cannot activate cards or effects until the end of the Damage Step

also your opponent's cards and effects cannot activate when a monster is Fusion Summoned this way

this card loses 500 ATK and DEF

your opponent cannot activate cards or effects when you Normal or Special Summon a monster(s)

Elemental Hero Aqua Neos [POTD-EN031] Ultimate Rare Sea Serpent your opponent cannot activate cardsSet: Power of the Duelist Card type: Fusion Effect Monster Rarity: Ultimate Rare Attack: 2500 Defense: 2000 "Elemental Hero Neos" + "Neo Spacian Aqua Dolphin" This card can only be Special Summoned from your Fusion Deck by returning the above cards from your side of the field to the Deck. (You do not use "Polymerization".) Once per turn, by discarding 1 card from your hand, select 1 random card from your opponent's hand and destroy it. This card