Nightmare Sonic Blast!
You can activate this Skill while you control "Serpent Night Dragon". Once per turn, you can reveal the top 4 cards of your Deck, and use 1 of the following Skills, depending on the number of monsters revealed.
1: Add one of the revealed cards to your hand.
2: Destroy 1 card your opponent controls.
3+: Apply both effects.
Then, place the rest of the revealed cards on top of your Deck in any order. 