| Attribute | WATER |
| Monster Type | Aqua |
| Card type | Effect |
| Card Effect Type | Ignition Effect / Trigger Effect / Condition |
| Level | ★7 |
| Passcode | 22446869 |
| ATK | 1700 |
| DEF | 2400 |
You can discard 1 other WATER monster to the Graveyard; Special Summon this card from your hand. When you do: 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.
| Pack | Cybernetic Rebellion [UR] |
| Level-up reward | -- |
| Victory against | -- |
| Card trader | -- |
| Other | -- |
| Rating | B |
Here are some monsters you can discard when Special Summoning Mermail Abyssteus to gain additional effects. Atlantean Marksman and Atlantean Heavy Infantry can respectively destroy a face-up card and face-down card your opponent controls. Mermail Abyssgunde and Mermail Abysshilde can respectively Special Summon a Mermail monster from your graveyard and hand
If Mermail Abyssteus searches Mermail Abyssdine from your deck, you can immediately Special Summon that searched Mermail Abyssdine. This puts 2 Special Summoned bodies on your field that you can use as tribute fodder.
Here are some other Mermail monsters you can search with Mermail Abyssteus’ effect.
Use a level-1 Tuner with your Special Summoned Mermail Abyssteus to make a level-8 Synchro monster. If you control no monsters you can first Special Summon Unknown Synchron and then Special Summon your Mermail Abyssteus.
| Actions | Discards for cost / Adds from Deck to hand |
| Summoning categories | Special Summons itself from your hand |
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 General discussion |  Vagabond trade |
 Deck advice |  Duel room |
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 Cards you should trade |  How to beat the Vegabond |  How to solve Duel Quizes |
| Standard Duelists | ||
|---|---|---|
| Lvl 14 | Lvl 20 | Lvl 27 |
| Lvl 33 | Lvl 39 | Lvl 45 |
| Lvl 51 | Lvl 57 | - |
| Legendary Duelists | ||
| Lvl 30 (DM) | Lvl 30 (GX) | Lvl 30 (5D's) |
Atlantean Marksman
Atlantean Heavy Infantry
Mermail Abyssgunde
Mermail Abysshilde
Mermail Abysslinde
Mermail Abyssmander
Mermail Abyssnose
Mermail Abyssocea
Mermail Abysspike
Mermail Abyssturge
Stardust Dragon
Red Dragon Archfiend
Angel of Zera
Thought Ruler Archfiend
Unknown Synchron
Mach Synchron
Sinister Sprocket
Anonymous
