45 cards where the illustration contains “mask-of-yawgmoth”

Armadillo Cloak (Invasion #229)
Ascendant Evincar (Nemesis #51)
Barbarian Outcast (Torment #92)
Barrin's Unmaking (Invasion #46)
Caves of Koilos (Dominaria United #244)
Caves of Koilos (Dominaria United #378)
Chime of Night (Urza's Destiny #56)
Contaminated Aquifer (Dominaria United #245)
Dark Ritual (Urza's Saga #127)
Defiler of Dreams (Dominaria United #46)
Dega Disciple (Apocalypse #4)
Diabolic Intent (Planeshift #42)
Disrupt (Invasion #51)
Distorting Wake (Invasion #52)
Ertai's Trickery (Planeshift #24)
Ertai, the Corrupted (Planeshift #107)
Ertai, the Corrupted (Planeshift #107★)
Fervent Charge (Apocalypse #98)
Get Your Head in the Game (Unfinity #10)
Gix (Vanguard Series #402)
Hinterland Harbor (Dominaria #240)
Holy Day (Invasion #20)
Kaito, Dancing Shadow (Phyrexia: All Will Be One #340)
Magus of the Will (Commander 2016 #14)
Mishra's Bauble (Coldsnap #138)
Necrotic Sliver (Planar Chaos #159)
Noble Panther (Invasion #257)
Oppression (Urza's Saga #143)
Phyrexian Awakening (March of the Machine #30)
Phyrexian Driver (Nemesis #64)
Phyrexian Plaguelord (Jumpstart 2022 #123)
Phyrexian Scriptures (Dominaria #100)
Phyrexian Snowcrusher (Coldsnap #140)
Phyrexian Tyranny (Planeshift #118)
Plague Spitter (Invasion #119)
Planar Portal (Invasion #308)
Rona, Disciple of Gix (Dominaria #203)
Sanguine Guard (Urza's Saga #155)
Smogbelcher Chariot (Alchemy: Dominaria #11)
Unyaro (March of the Machine Commander #68)
Urborg, Tomb of Yawgmoth (Ultimate Box Topper #U40)
Urza Assembles the Titans (Dominaria United #37)
Western Paladin (Urza's Saga #168)
Yawgmoth Demon (Ninth Edition #170)
Yawgmoth's Vile Offering (March of the Machine Commander #271)

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