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

Vivien, Monsters' Advocate (Borderless)
[Ikoria: Lair of Behemoths]

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Abyssal Harvester (Borderless) (Mana Foil)
[Foundations]

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Token: Yuya
[TKN5-EN015 Super Rare]

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D.D. Assailant
[BP02-EN028 Rare]

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Token: Yusei
[TKN5-EN013 Super Rare]

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Nethroi, Apex of Death (Showcase)
[Ikoria: Lair of Behemoths]

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Manticore of Darkness
[SDOK-EN005 Common]

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Elesh Norn, Mother of Machines (Borderless Manga Step-and-Compleat Foil)
[Phyrexia: All Will Be One]

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The Book of Vile Darkness (Extended Art)
[Dungeons & Dragons: Adventures in the Forgotten Realms]

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Obelisk the Tormentor
[MVPC-EN001 Gold Secret Rare]

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Vivien, Monsters' Advocate
[Ikoria: Lair of Behemoths]

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Samurai of the Ice Barrier
[BP02-EN088 Mosaic Rare]

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Lancea, Ancestral Dragon of the Ice Mountain (Quarter Century Secret Rare)
[BLTR-EN005 Quarter Century Secret Rare]

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Thorn of Amethyst - Shards of Narsil
[The Lord of the Rings: Tales of Middle-Earth Commander]

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Dungeon Mayhem: Monster Madness

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Umbral Horror Will o' the Wisp
[JOTL-EN014 Common]

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