Your search for "*monster of the abyss*" revealed the following:
Lacrima the Crimson Tears
[ROTA-EN014 Secret Rare]
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Surfacing Big Jaws
[ROTA-EN001 Ultra Rare]
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Mermail Abyssmegalo
[BP02-EN117 Mosaic Rare]
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Abyss Keeper
[MP22-EN234 Ultra Rare]
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Empress of Prophecy
[ABYR-EN047 Ultra Rare]
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Mermail Abyssmegalo
[BP02-EN117 Rare]
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Metalzoa X
[ROTA-EN006 Super Rare]
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Rubysapphirus, the Adamant Jewel
[ROTA-EN044 Common]
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Anarchist Monk of the Six Samurai
[ROTA-EN019 Common]
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Diabolos, King of the Abyss
[FOTB-EN061 Secret Rare]
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Denial Deity Dotan
[ROTA-EN087 Common]
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Poseidra Abyss, the Atlantean Dragon Lord
[ROTA-EN043 Ultra Rare]
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Mermail King - Neptabyss (Quarter Century Secret Rare)
[ROTA-EN046 Quarter Century Secret Rare]
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Mermail King - Neptabyss (Quarter Century Secret Rare)
[ROTA-EN046 Quarter Century Secret Rare]
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Fiendsmith's Agnumday
[ROTA-EN045 Super Rare]
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Number C32: Shark Drake LeVeiss
[ROTA-EN041 Super Rare]
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Drake Shark
[ROTA-EN002 Super Rare]
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