40 cards where the illustration contains “footprint”

Acidic Soil (Urza's Saga #172)
Birthday Escape (The Lord of the Rings: Tales of Middle-earth #43)
Call to Arms (Ice Age #10)
Deadeye Tracker (Ixalan #99)
Endless Sands (Hour of Devastation #176)
Followed Footsteps (Ravnica: City of Guilds #51)
Follow the Tracks (Alchemy Horizons: Baldur's Gate #67)
Footfall Crater (Ikoria: Lair of Behemoths #118)
Foxfire (Ice Age #238)
Giant Strength (Legends #149)
Griffnaut Tracker (Murders at Karlov Manor #17)
Guardian Kirin (Modern Horizons 2 #15)
Hashep Oasis (Hour of Devastation #177)
Hoofprints of the Stag (Lorwyn #21)
Hotfoot Gnome (The Lost Caverns of Ixalan #154)
Into the Night (Innistrad: Crimson Vow #163)
Into the Night (Innistrad: Double Feature #430)
Jokulmorder (Coldsnap #37)
Karplusan Yeti (Ninth Edition #198)
Mountain (European Land Program #13)
No Witnesses (Murders at Karlov Manor #390)
Oasis (Arabian Nights #78)
On the Trail (Murders at Karlov Manor Commander #39)
Relentless Pursuit (Theros Beyond Death #195)
Resize (Coldsnap #117)
Rift (Mystery Booster Playtest Cards 2019 #119)
Rockfall Vale (Innistrad: Midnight Hunt #266)
Ruby Collector (Alchemy: Outlaws of Thunder Junction #3)
Scene of the Crime (Murders at Karlov Manor #267)
Shoreline Scout (Jumpstart: Historic Horizons #12)
Step Through (Modern Horizons 2 #392)
Stomping Ground (Ravnica: Clue Edition #281)
Swamp (Secret Lair Drop #65)
Tiger-Tribe Hunter (Adventures in the Forgotten Realms #163)
Timberline Ridge (Ice Age #361)
Time Walk (Vintage Championship #2018NA)
Track Down (Core Set 2021 #211)
Twice Upon a Time // Unlikely Meeting (Doctor Who #61)
Wayward Servant (Amonkhet #208)
Wings of the Cosmos (Kaldheim #39)

This search is finished. Now the real work can begin.