وحش البحر

You can discard 1 card, then declare 1 Attribute, except WATER; Special Summon this card from your hand to either field, then this card becomes that Attribute (until the end of this turn), then if you Special Summoned this card to your opponent's field, you can Special Summon 1 Level 4 or lower Fiend monster with an original Attribute other than the declared one, from your hand or GY to your field, also for the rest of this turn, you cannot Special Summon from the Extra Deck, except Fiend monsters. You can only use this effect of "Dipsea Fiend" once per turn.