23 cards where the power = 4 and the toughness = 3 and the text includes “flying” and the colors is U

Aerial Caravan (Mercadian Masques #58)
Agency Outfitter (Murders at Karlov Manor #38)
Air Servant (Welcome Deck 2016 #4)
Argent Sphinx (Modern Masters 2015 #41)
Croakid Amphibonaut (Unfinity #43)
Defiler of Dreams (Dominaria United #46)
Djinn of Fool's Fall (Outlaws of Thunder Junction #43)
Dream Eater (Murders at Karlov Manor Commander #101)
Esperzoa (Double Masters #49)
Ethereal Whiskergill (Lorwyn #60)
Icefall Regent (Archenemy: Nicol Bolas #24)
Juvenile Mist Dragon (Commander Legends: Battle for Baldur's Gate #79)
Long-Finned Skywhale (Kaladesh #54)
Mindlink Mech (Kamigawa: Neon Dynasty #62)
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time (The Lost Caverns of Ixalan #67)
Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time (The Lost Caverns of Ixalan #67)
Quicksilver Fisher (Phyrexia: All Will Be One #66)
Sea Drake (Modern Horizons 2 #268)
Silver Wyvern (Tempest Remastered #68)
Soulblade Djinn (Game Night #24)
Umara Wizard // Umara Skyfalls (Zendikar Rising #86)
Umara Wizard // Umara Skyfalls (Zendikar Rising #86)
Windcaller Aven (Commander Masters #133)
Wind-Kin Raiders (Aether Revolt #50)
Windrider Patrol (Battle for Zendikar #89)

The arc of my blade has carved a path of light to the end of these results.