You can only use the 1st and 2nd effect of this card’s name each once per turn.
(1) Draw cards equal to the number of different Types among Fish, Sea Serpent, and Aqua monsters you control, also you cannot Special Summon from the Extra Deck until the end of your next turn after this card resolves, except WATER monsters.
(2) If a face-up WATER monster(s) you control is destroyed by battle or card effect while this card is in your GY: You can banish this card; add 1 “Mermail” monster from your GY or banishment to your hand.