52 cards where the text includes “islandwalk”

Adrestia (Assassin's Creed #68)
Benthic Behemoth (Seventh Edition #63)
Benthic Djinn (Mirage #257)
Bull Hippo (Seventh Edition #233)
Chasm Skulker (March of the Machine Commander #218)
Cold-Eyed Selkie (Outlaws of Thunder Junction Commander #218)
Colossal Whale (Magic 2014 #48)
Coral Barrier (Magic 2015 #49)
Deeptread Merrow (Lorwyn #57)
Devouring Deep (Legends #50)
Enclave Elite (Conspiracy #96)
Fishliver Oil (Ninth Edition #77)
Goblin Flotilla (Fallen Empires #55)
Gosta Dirk (Legends #227)
Grayscaled Gharial (Ravnica: City of Guilds #52)
Halimar Wavewatch (Rise of the Eldrazi #72)
Harbor Serpent (Magic 2013 #53)
Inkfathom Divers (Duel Decks: Merfolk vs. Goblins #8)
Inkwell Leviathan (Double Masters #55)
Island Sanctuary (Masters Edition IV #15)
Lord of Atlantis (Time Spiral Timeshifted #24)
Lurking Crocodile (Magic 2012 #184)
Master of the Pearl Trident (The Lost Caverns of Ixalan Commander #162)
Meandering Towershell (Khans of Tarkir #141)
Merfolk Assassin (Time Spiral Timeshifted #25)
Merfolk Raiders (Mirage #75)
Merfolk Seastalkers (Zendikar #55)
Merfolk Spy (Magic 2014 #62)
Merrow Harbinger (Lorwyn #73)
Mystic Decree (Masters Edition IV #53)
Pale Bears (Ice Age #256)
Part Water (Legends #66)
Piracy Charm (Time Spiral Remastered #78)
Rishadan Dockhand (Modern Horizons 2 #59)
River Bear (Ninth Edition #266)
River Boa (Duel Decks: Jace vs. Vraska #49)
Rootwater Commando (Tenth Edition #102)
Sandals of Abdallah (Arabian Nights #69)
Sand Squid (Mercadian Masques #96)
Segovian Leviathan (Classic Sixth Edition #97)
Shore Snapper (Shards of Alara #87)
Stonybrook Banneret (The Lost Caverns of Ixalan Commander #173)
Stormtide Leviathan (Commander Legends #407)
Streambed Aquitects (Duel Decks: Merfolk vs. Goblins #18)
Sygg, River Guide (Lorwyn #251)
Thada Adel, Acquisitor (Worldwake #40)
The Flood of Mars (Doctor Who #45)
The Sea Devils (Doctor Who #108)
Undertow (Legends #82)
War Barge (Time Spiral Timeshifted #116)
Wrexial, the Risen Deep (New Capenna Commander #359)
Zodiac Horse (Portal Three Kingdoms #159)

The arc of my blade has carved a path of light to the end of these results.