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

Pontiff of Blight
[Dungeons & Dragons: Adventures in the Forgotten Realms Commander]

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Witch-king of Angmar (Borderless Alternate Art)
[The Lord of the Rings: Tales of Middle-Earth]

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Krebons
[BP02-EN068 Mosaic Rare]

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

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Thopter // Beast Double-Sided Token
[March of the Machine Commander Tokens]

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Paths of the Dead - Cavern of Souls (Surge Foil Realms and Relics)
[The Lord of the Rings: Tales of Middle-Earth Commander]

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Zombyra the Dark
[BP02-EN014 Mosaic Rare]

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Mobius the Frost Monarch
[SOD-EN022 Ultimate Rare]

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Gravekeeper's Assailant
[TU02-EN002 Super Rare]

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Caius the Mega Monarch
[MP15-EN215 Ultra Rare]

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Ob Nixilis, Captive Kingpin
[March of the Machine: The Aftermath]

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Orcust Harp Horror
[BLTR-EN071 Ultra Rare]

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King of the Skull Servants
[TLM-EN032 Common]

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Inscription of Abundance
[March of the Machine Commander]

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Terra the Terrible
[LOB-080 Common]

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Excise the Imperfect (Extended Art)
[March of the Machine Commander]

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