40 cards where (the card types include “wizard” or the text includes “changeling”) and it’s legal in Modern and the text includes “flash”

Ashiok's Forerunner (Theros Beyond Death #277)
Aven Mindcensor (Commander Legends: Battle for Baldur's Gate #688)
Burrog Befuddler (Strixhaven: School of Mages #38)
Crookclaw Transmuter (Time Spiral Remastered #59)
Deputy of Acquittals (Ravnica Remastered #177)
Dralnu, Lich Lord (Time Spiral Remastered #251)
Ertai Resurrected (Dominaria United #199)
Ethersworn Shieldmage (Archenemy #84)
Faerie Harbinger (Lorwyn #61)
Frilled Mystic (Ravnica Remastered #183)
Gandalf, Friend of the Shire (The Lord of the Rings: Tales of Middle-earth #50)
Gandalf the White (The Lord of the Rings: Tales of Middle-earth #19)
Glamer Spinners (Shadowmoor #141)
Harbinger of the Tides (Duel Decks: Merfolk vs. Goblins #7)
Inspired Sprite (Morningtide #37)
Izzet Staticaster (Return to Ravnica #173)
Lier, Disciple of the Drowned (Innistrad: Midnight Hunt #59)
Merfolk Trickster (Dominaria #56)
Mistbind Clique (Lorwyn #75)
Mizzium Meddler (Magic Origins #64)
Najal, the Storm Runner (Dominaria United #208)
Naru Meha, Master Wizard (Commander 2021 #124)
Nimble Obstructionist (Commander 2020 #121)
Obscura Interceptor (Streets of New Capenna #209)
Prismwake Merrow (Shadowmoor #46)
Prophet of Kruphix (Theros #199)
Raff Capashen, Ship's Mage (Commander Masters #351)
Silumgar Sorcerer (Dragons of Tarkir #76)
Snapcaster Mage (Ultimate Masters #71)
Spellstutter Sprite (Modern Masters #65)
Teferi, Mage of Zhalfir (Time Spiral Remastered #91)
Teferi's Wavecaster (Core Set 2021 #327)
Tishana's Tidebinder (The Lost Caverns of Ixalan #81)
Vedalken Aethermage (Future Sight #61)
Vendilion Clique (Masters 25 #76)
Venser, Shaper Savant (Double Masters 2022 #66)
Vodalian Hexcatcher (Dominaria United #75)
Voidmage Husher (Time Spiral #92)
Wind Strider (Ixalan #88)
Wydwen, the Biting Gale (Commander 2020 #235)

Though this query has ended, its relics still slumber in New Argive.