Number 80: Rhapsody in Berserk [AP06-EN010] Super Rare Sealed Box that target loses ATK and

that target loses ATK and DEF equal to the ATK and DEF of the "Burning Abyss" monster sent to the Graveyard this way

if your other DARK Spellcaster-Type monster battles an opponent's monster: You can send this card from your hand or face-up from your field to the Graveyard

If damage calculation is performed involving this Fusion Summoned card

you can banish this card from your Graveyard instead

so you can use existing cards like Heritage of the Chalice to make your Deck even stronger

Number 80: Rhapsody in Berserk [AP06-EN010] Super Rare Sealed Box that target loses ATK andSet: Astral Pack 6 Card type: Xyz Effect Monster Rarity: Super Rare Attack: 0 Defense: 1200 2 Level 4 monsters You can target 1 face up Xyz Monster you control; equip this monster you control to that target. It gains 1200 ATK. You can detach 1 Xyz Material from this card, then target 1 card in your opponent's Graveyard; banish that target. You can use this effect of "Number 80: Rhapsody in Berserk" up to twice per turn.