28 cards where the set is “lci” and the text includes “descend”

Akawalli, the Seething Tower (The Lost Caverns of Ixalan #220)
Basking Capybara (The Lost Caverns of Ixalan #175)
Brass's Tunnel-Grinder // Tecutlan, the Searing Rift (The Lost Caverns of Ixalan #135)
Brass's Tunnel-Grinder // Tecutlan, the Searing Rift (The Lost Caverns of Ixalan #135)
Broodrage Mycoid (The Lost Caverns of Ixalan #95)
Canonized in Blood (The Lost Caverns of Ixalan #96)
Child of the Volcano (The Lost Caverns of Ixalan #140)
Coati Scavenger (The Lost Caverns of Ixalan #179)
Corpses of the Lost (The Lost Caverns of Ixalan #98)
Council of Echoes (The Lost Caverns of Ixalan #51)
Deep Goblin Skulltaker (The Lost Caverns of Ixalan #101)
Didact Echo (The Lost Caverns of Ixalan #53)
Echo of Dusk (The Lost Caverns of Ixalan #104)
Enterprising Scallywag (The Lost Caverns of Ixalan #148)
Frilled Cave-Wurm (The Lost Caverns of Ixalan #57)
Join the Dead (The Lost Caverns of Ixalan #110)
Malamet Veteran (The Lost Caverns of Ixalan #201)
Molten Collapse (The Lost Caverns of Ixalan #234)
Ruin-Lurker Bat (The Lost Caverns of Ixalan #33)
Stalactite Stalker (The Lost Caverns of Ixalan #122)
Starving Revenant (The Lost Caverns of Ixalan #123)
Stinging Cave Crawler (The Lost Caverns of Ixalan #124)
The Ancient One (The Lost Caverns of Ixalan #222)
The Everflowing Well // The Myriad Pools (The Lost Caverns of Ixalan #56)
The Everflowing Well // The Myriad Pools (The Lost Caverns of Ixalan #56)
The Mycotyrant (The Lost Caverns of Ixalan #235)
Uchbenbak, the Great Mistake (The Lost Caverns of Ixalan #242)
Wail of the Forgotten (The Lost Caverns of Ixalan #244)
Waterlogged Hulk // Watertight Gondola (The Lost Caverns of Ixalan #83)
Waterlogged Hulk // Watertight Gondola (The Lost Caverns of Ixalan #83)
Zoyowa Lava-Tongue (The Lost Caverns of Ixalan #245)

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