43 cards where the illustration contains “falling-rock”

Acrobatic Leap (The Lost Caverns of Ixalan #2)
Aftershock (Tempest #160)
Astral Slide (Onslaught #4)
Barrage of Boulders (Khans of Tarkir #100)
Calamitous Cave-In (The Lost Caverns of Ixalan #139)
Chiss-Goria, Forge Tyrant (Phyrexia: All Will Be One Commander #35)
Collapsing Borders (Invasion #141)
Crush the Weak (Kaldheim #128)
Cunning Survivor (Hour of Devastation #33)
Dark Maze (Fifth Edition #80)
Demolish (Theros #118)
Downhill Charge (Nemesis #79)
Duke Ulder Ravengard (Commander Legends: Battle for Baldur's Gate #272)
Dwarven Blastminer (Onslaught #199)
Earthquake (Seventh Edition #180)
Earth Tremor (Commander Legends: Battle for Baldur's Gate #171)
Exploding Borders (Conflux #106)
Fiery Emancipation (Core Set 2021 #143)
Mine Collapse (Modern Horizons 2 #135)
Molten Collapse (The Lost Caverns of Ixalan #234)
Mountain (Jumpstart #67)
Nahiri's Stoneblades (War of the Spark #139)
Phyrexian Colossus (Eighth Edition #309)
Pinpoint Avalanche (Onslaught #221)
Rain of Tears (Tempest #149)
Roil Eruption (Zendikar Rising #155)
Rumbling Rockslide (The Lost Caverns of Ixalan #163)
Rumbling Rockslide (Ikoria: Lair of Behemoths #134)
Sandstone Deadfall (Odyssey #307)
Seismic Shift (Dominaria #141)
Shatterskull Smashing // Shatterskull, the Hammer Pass (Zendikar Rising #161)
Shatterskull Smashing // Shatterskull, the Hammer Pass (Zendikar Rising #161)
Sheer Drop (Duel Decks: Zendikar vs. Eldrazi #9)
Spire Barrage (Zendikar #150)
Stone Rain (Seventh Edition #221)
Stone Rain (Portal Three Kingdoms #123)
Stone Rain (Tempest #206)
Tectonic Hazard (The Lost Caverns of Ixalan #169)
Tooth, Claw, and Tail (Archenemy Schemes #40★)
Tremor (Mercadian Masques #220)
Undermountain Adventurer (Commander Legends: Battle for Baldur's Gate #260)
Unstable Glyphbridge // Sandswirl Wanderglyph (The Lost Caverns of Ixalan #41)
Unstable Glyphbridge // Sandswirl Wanderglyph (The Lost Caverns of Ixalan #41)
Volatile Fault (The Lost Caverns of Ixalan #286)
Zealot of the God-Pharaoh (Hour of Devastation #207)

The message was clear to Sorin—time to search for something else.