In addition, once per turn, you can remove 2 Xyz Materials from a Rank 4 Sea Serpent-Type Xyz Monster on your field and make your Life Points 1000. If you Xyz Summon "Number 32: Shark Drake" during this turn, you can also Xyz Summon it by using that Xyz Monster as its material.
This Skill can only be used/applied if you begin the Duel with a Deck (excluding Extra Deck) that contains no monsters other than at least 10 Level 4 or lower WATER monsters.
Does anyone know why the skill might not be working? I have the requirements of at least 10 level 4 or lower water monsters. I do have shark drake already in my extra but i dont think that should matter. Viess or/and another shark drake are not showing up in my deck when i battle