[ Aqua / Effect ]You can discard 1 other WATER monster to the GY; Special Summon this card from your hand.
When Summoned this way: You can add 1 Level 4 or lower "Mermail" monster from your Deck to your hand.
You can only use this effect of "Mermail Abyssteus" once per turn.
ATK/ 1700
DEF/ 2400