30 cards where the card types include “leech” or the text includes “leech”

Abundant Maw (Eldritch Moon #1)
Alabaster Leech (Invasion #1)
Andradite Leech (Invasion #93)
Balemurk Leech (Duskmourn: House of Horror #84)
Bewitching Leechcraft (The Lord of the Rings: Tales of Middle-earth #41)
Blitz Leech (Ikoria: Lair of Behemoths #74)
Curse of Leeches // Leeching Lurker (Innistrad: Midnight Hunt #94)
Curse of Leeches // Leeching Lurker (Innistrad: Midnight Hunt #94)
Festerleech (Murders at Karlov Manor #85)
Fumulus, the Infestation (Foundations Jumpstart #42)
Furgul, Quag Nurturer (Alchemy: Murders at Karlov Manor #23)
Gargantuan Leech (The Lost Caverns of Ixalan #107)
Jade Leech (Invasion #190)
Jorubai Murk Lurker (Magic 2015 #65)
Land Leeches (Fourth Edition #255)
Leech Bonder (Shadowmoor #43)
Leeches (Masters Edition IV #18)
Leech Fanatic (Strixhaven: School of Mages #75)
Leech Gauntlet (Kamigawa: Neon Dynasty #106)
Leeching Licid (Tempest #141)
Leechridden Swamp (Duskmourn: House of Horror Commander #286)
Mana Leech (Urza's Saga #141)
Mana Skimmer (Time Spiral #117)
Mindleech Ghoul (Innistrad: Crimson Vow #122)
Mindleech Mass (Ravnica Remastered #201)
Monstrous War-Leech (Dominaria United #98)
Putrid Leech (Duel Decks: Jace vs. Vraska #51)
Ruby Leech (Invasion #161)
Sapphire Leech (Invasion #71)
Slimy Dualleech (Murders at Karlov Manor #104)
Squelching Leeches (Duel Decks: Nissa vs. Ob Nixilis #62)

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