Number 47: Nightmare Shark (CT11-EN004) Limited [2014 Mega-Tins]

2 Level 3 monsters
When this card is Special Summoned: You can attach 1 Level 3 WATER monster from your hand or your side of the field to this card as an Xyz Material. Once per turn: You can detach 1 Xyz Material from this card, then target 1 WATER monster you control; this turn, that monster can attack your opponent directly, also other monsters cannot attack.