Your search for "*Monster of the Abyss*" revealed the following:

Fell Beast of Mordor (Borderless)
[The Lord of the Rings: Tales of Middle-Earth Commander]

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Paths of the Dead - Cavern of Souls (Serialized)
[The Lord of the Rings: Tales of Middle-Earth Commander]

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Psychosis Crawler (Retro Schematic) (Serialized)
[The Brothers' War Retro Artifacts]

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World Legacy Monstrosity
[MP20-EN076 Prismatic Secret Rare]

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Necro Gardna
[BP02-EN052 Mosaic Rare]

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Ad Libitum of Despia
[MP22-EN192 Common]

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Basalt Monolith
[The Lord of the Rings: Tales of Middle-Earth Commander]

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Coordius the Triphasic Dealmon
[MP22-EN046 Common]

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Dragoness the Wicked Knight
[LOB-086 Rare]

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Monk // Phyrexian Hydra (11) Double-Sided Token
[March of the Machine Tokens]

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Overlord of the Floodpits (Japan Showcase) (Japanese)
[Duskmourn: House of Horror]

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Sword of the Animist
[Commander Masters]

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Mermaid Knight
[AST-025 Common]

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Phantasmal Abomination
[Rise of the Eldrazi]

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Rona, Herald of Invasion // Rona, Tolarian Obliterator (Showcase Planar Booster Fun)
[March of the Machine]

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Lady of the Lake
[NKRT-EN013 Platinum Rare]

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