Mermail King - Neptabyss (Quarter Century Secret Rare)

Mermail King - Neptabyss (Quarter Century Secret Rare) came out in October 2024; we leave the first weeks out of this story, because early prices are set before real supply exists. In the last year the price changed −28.1% and ranged from $11.64 to $15.93, and it now trades near the bottom of that range. Listings currently start at $10.25; over the last 30 days the market price averaged $12.00.

2+ monsters, including a Fish, Sea Serpent, or Aqua monster
Your opponent cannot target WATER monsters this card points to with card effects. You can only use each of the following effects of "Mermail King - Neptabyss" once per turn. If a WATER monster(s) is sent to the GY to activate a card or effect (except during the Damage Step): You can take 1 "Abyss-" Equip Spell from your Deck or GY and either add it to your hand or equip it to this card. If this card in its owner's possession is destroyed by an opponent's card: You can add 1 "Atlantean" or "Mermail" monster from your Deck to your hand.