Gellenduo [STON-EN067] Secret Rare BT9-137 Once per turn: You can

Once per turn: You can Tribute 1 face-up "Gem-" monster to have this card gains ATK equal to the Tributed monster's ATK

Set: Astral Pack 6 Card type: Normal Trap Rarity: Ultimate Rare When a monster that was Special Summoned this turn activates its effect on your opponent's side of the field: Negate that effect

If it's a permanent card

Battleworn (If you defend with Tectonic Plating

heavy with import

Gellenduo [STON-EN067] Secret Rare BT9-137 Once per turn: You canSet: Strike of Neos Card type: Effect Monster Rarity: Secret Rare Attack: 1700 Defense: 0 This card cannot be destroyed by battle. When this card's controller takes any damage, destroy this card. If you Tribute Summon a LIGHT Fairy Type monster, you can treat this 1 monster as 2 Tribute Monsters for the Tribute Summon.