Coralianectes, the Luminous Cradle Dragon

“While you control "Umi", your opponent cannot target WATER Link Monsters you control with card effects. If this card is added to your hand, except by drawing it: You can reveal this card and 1 WATER monster in your hand; Special Summon both, also you cannot Special Summon for the rest of this turn, except WATER monsters. You can only use this effect of "Coralianectes, the Luminous Cradle Dragon" once per turn.”