26 cards where the card has the keyword “Delve” and the border color is “black”

Become Immense (Ultimate Masters #157)
Dead Drop (Khans of Tarkir #67)
Death Rattle (Modern Masters #78)
Dig Through Time (Duskmourn: House of Horror Commander #115)
Empty the Pits (Khans of Tarkir #72y)
Ethereal Forager (Commander 2020 #34)
Gurmag Angler (Ultimate Masters #102)
Hogaak, Arisen Necropolis (Modern Horizons #202)
Hooting Mandrills (Ultimate Masters #170)
Logic Knot (Time Spiral Remastered #73)
Magmatic Sinkhole (Modern Horizons #135)
Murderous Cut (Khans of Tarkir #81y)
Murktide Regent (Modern Horizons 2 #52)
Necropolis Fiend (Khans of Tarkir #82)
Rite of Undoing (Fate Reforged #49)
Set Adrift (Khans of Tarkir #54)
Shambling Attendants (Khans of Tarkir #89y)
Sibsig Muckdraggers (Fate Reforged #83)
Soulflayer (Commander 2020 #138)
Sultai Scavenger (Khans of Tarkir #91)
Tasigur's Cruelty (Fate Reforged #88)
Tasigur, the Golden Fang (Ultimate Masters #117)
Temporal Trespass (Fate Reforged #55)
Tombstalker (Time Spiral Remastered #146)
Treasure Cruise (Outlaws of Thunder Junction Commander #120)
Will of the Naga (Fate Reforged #58)

It is the moment of discovery, the triumph of the mind, and the end of these results.