22 cards where the text includes “cascade” and the color identity ≤ GUW and (the card is available on Paper)

Annoyed Altisaur (Modern Horizons 3 #284)
Apex Devastator (Commander Legends #217)
Ardent Plea (Alara Reborn #1)
Captured Sunlight (Alara Reborn #66)
Cascade Seer (Zendikar Rising #48)
Dreamroot Cascade (Innistrad: Crimson Vow #262)
Enlisted Wurm (Planechase Anthology #90)
Ethersworn Sphinx (Modern Horizons 2 #195)
Forceful Denial (Commander Legends #69)
Heralds of Tzeentch (Warhammer 40,000 Commander #23)
Imoti, Celebrant of Bounty (Commander Legends #280)
Ingenuity Engine (Commander Legends #317)
Maelstrom Colossus (Commander Legends #322)
Natural Reclamation (Commander Legends: Battle for Baldur's Gate #829)
Sakashima's Protege (Commander Legends #90)
Shardless Agent (Modern Horizons 2 #292)
Skyline Cascade (Battle for Zendikar #246)
Stormcaller's Boon (Alara Reborn #13)
Sweet-Gum Recluse (Commander Legends: Battle for Baldur's Gate #835)
TARDIS (Doctor Who #187)
The First Doctor (Doctor Who #128)
Zhulodok, Void Gorger (Commander Masters #704)

It is the moment of discovery, the triumph of the mind, and the end of these results.