Black Torrential Drake

|Black Torrential Drake|Sea Serpent/Xyz/Effect|6|Dark||2900|2000|3 Level 6 Monsters. This card on field is treated as a WATER monster. While it has Xyz Materials, all monsters your opponent controls lose 600 ATK and DEF. When a player set a Spell/Trap card, they cannot activate it until their next turn. When this card destroys a monster by battle and sends it to the Graveyard: You can detach 1 Xyz Material from this card; Special Summon that monster to your opponent's side of the field in face-up Attack Position but it loses 600 ATK and DEF and its effects are negated, and if you do Summon this way, this card gains 600 ATK and DEF and it can attack once again during this Battle Phase.|

I really like this card. It does require 3 Level 6 monsters, but it gets you a beatstick that dodges S/T your opponent just set and get you an extra monster + attack. I'd use it