YuGiOh Legendary Duelists Duels From The Deep Rare Sea Stealth II LED9-EN021

Unclassified. Continuous-like. Trigger-like. Condition. Continuous. This card's name becomes Umi while face-up on the field or in the GY. Your opponent cannot target WATER monsters you control with non-WATER monsters' effects. At the start of the Battle Phase: You can Special Summon 1 monster that specifically lists Umi in its text or 1 WATER Normal Monster from your hand or GY in Defense Position, but destroy it at the end of the Battle Phase. You can only use this effect of Sea Stealth II once per turn.