Your search for "*monster of the abyss*" revealed the following:

Eye of Ojer Taq // Apex Observatory (Extended Art)
[The Lost Caverns of Ixalan Commander]

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Chevill, Bane of Monsters (Promo Pack)
[Ikoria: Lair of Behemoths Promos]

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Mermail Abyssalacia
[DANE-EN094 Ultra Rare]

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Assault Wyvern
[MVP1-ENG03 Gold Rare]

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Sea-Dasher Octopus
[Ikoria: Lair of Behemoths]

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Aclazotz, Deepest Betrayal Art Card
[The Lost Caverns of Ixalan Art Series]

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Aclazotz, Deepest Betrayal Art Card (Gold-Stamped Signature)
[The Lost Caverns of Ixalan Art Series]

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Aclazotz, Deepest Betrayal // Temple of the Dead
[The Lost Caverns of Ixalan Prerelease Cards]

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Witch's Apprentice
[MRD-121 Rare]

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Bast, Panther Goddess
[Marvel Super Heroes Commander]

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Yidaro, Wandering Monster - Godzilla, Doom Inevitable (Godzilla Series)
[Ikoria: Lair of Behemoths]

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Fiend Scorpion
[AST-059 Common]

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Psiics, Moonlight of the Ghoti
[PHNI-EN016 Super Rare]

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Supply
[LON-EN075 Common]

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Invasion of New Phyrexia // Teferi Akosa of Zhalfir
[March of the Machine]

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Abhorrent Oculus (Promo Pack)
[Duskmourn: House of Horror Promos]

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