You can only use the 1st and 2nd effect of this card’s name each once per turn.
(1) You can target 1 face-up card your opponent controls; destroy 1 “Icejade” monster you control, and if you do, negate that target’s effects until the end of this turn.
(2) If a face-up WATER monster(s) you control leaves the field by your opponent, except by being destroyed: You can take 1 “Icejade” monster from your Deck and either add it to your hand or Special Summon it.