Upcoming nerf? Agree?
Can be used each time your Life Points decrease by 1000.
This Skill can only be used if you begin the Duel with a Deck/Extra Deck that contains no monsters other than WATER monsters. Your Extra Deck must contain only XYZ monsters.
I disagree with that nerf idea. While I believe that "Territory of the Sharks" is good as it is right now, a better idea would be to restrict the extra deck to just Xyz Water Monsters.