28 cards where the illustration contains “walkway”

Azorius Guildgate (Ravnica Allegiance #244)
Emergence Zone (War of the Spark #245)
Enhanced Surveillance (Guilds of Ravnica #40)
Fire and Brimstone (The Dark #9)
Flitterstep Eidolon (Born of the Gods #40)
Forest (War of the Spark #262)
Forest (Mirrodin #306)
Ghirapur Orrery (Kaladesh #216)
Goblin Lookout (Legions #101)
Golgari Rot Farm (Ravnica: City of Guilds #278)
Haazda Marshal (Guilds of Ravnica #13)
Hired Poisoner (Guilds of Ravnica #72)
Izzet Guildgate (Guilds of Ravnica #251)
Nightveil Predator (Guilds of Ravnica #191)
Notion Rain (Guilds of Ravnica #193)
Ochran Assassin (Guilds of Ravnica #194)
Ooze (Innistrad Tokens #10)
Open the Gates (Ravnica Allegiance #133)
Orzhov Guildgate (Ravnica Allegiance #253)
Price of Fame (Guilds of Ravnica #83)
Selesnya Guildgate (Guilds of Ravnica #255)
Shimmer of Possibility (Ravnica Allegiance #51)
Smelt-Ward Minotaur (Guilds of Ravnica #116)
Spara's Headquarters (Streets of New Capenna #355)
Swamp (GRN Guild Kit #25)
Urban Utopia (Guilds of Ravnica #146)
Viridescent Bog (Fallout #154)
Wall of Mist (Guilds of Ravnica #58)

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