30 cards where the name includes “.cubi”

Ashiok, Nightmare Muse (Theros Beyond Death #208)
Ashiok, Nightmare Weaver (Theros #188)
Athreos, Shroud-Veiled (Theros Beyond Death #269)
Bower Passage (Avacyn Restored #170)
Brisela, Voice of Nightmares (Eldritch Moon #15b)
Chainer, Nightmare Adept (Modern Horizons 2 #289)
Cloaked Siren (Journey into Nyx #32)
Covert Operative (Legions #33)
Covert Technician (Kamigawa: Neon Dynasty #49)
Den of the Bugbear (Adventures in the Forgotten Realms #254)
Dragonlair Spider (Planechase 2012 #87)
Elkin Lair (Visions #78)
Faeburrow Elder (Dominaria United Commander #149)
Goddric, Cloaked Reveler (Wilds of Eldraine #132)
Lair of the Ashen Idol (Planechase 2012 Planes #24)
Lairwatch Giant (Lorwyn #29)
Lay Bare the Heart (Amonkhet #96)
Neva, Stalked by Nightmares (Wilds of Eldraine #209)
Nightmare Shepherd (Theros Beyond Death #108)
Night Terrors (Innistrad #111)
Overgrown Arch (Strixhaven: School of Mages #139)
Overgrown Battlement (New Capenna Commander #303)
Overgrown Estate (Apocalypse #113)
Overgrown Tomb (Ravnica Remastered #283)
Sivriss, Nightmare Speaker (Commander Legends: Battle for Baldur's Gate #148)
Sporecap Spider (Throne of Eldraine #176)
Swimmer in Nightmares (Theros Beyond Death #275)
Taken by Nightmares (Wilds of Eldraine #112)
Uncovered Clues (Dragon's Maze #19)
Undergrowth Recon (Murders at Karlov Manor #181)

Though this query has ended, its relics still slumber in New Argive.