Number 84: Pain Gainer (BLC1-EN151)

2 Level 11 monsters
You can also Xyz Summon this card by using a Rank 8, 9, or 10 DARK Xyz Monster you control with 2 or more materials. (Transfer its materials to this card.) Gains DEF equal to the combined Ranks of all Xyz Monsters you control x 200. While this card has material each time your opponent activates a Spell/Trap Card, inflict 600 damage to your opponent immediately after it resolves. Once per turn: You can detach 1 material from this card; destroy all face-up monsters your opponent controls with DEF less than or equal to this card's.