53 cards where the illustration contains “blue-fire”

Abomination of Gudul (Khans of Tarkir #159)
Altar of the Brood (Khans of Tarkir #216)
Arcanis the Omnipotent (Onslaught #66)
Architect of the Untamed (Kaladesh #143)
Arjun, the Shifting Flame (Commander 2015 #42)
Arm with Aether (New Phyrexia #28)
Blast-Furnace Hellkite (The Brothers' War Commander #12)
Bribery (Judge Gift Cards 2013 #2)
Cauldron Dance (Invasion #238)
Chiss-Goria, Forge Tyrant (Phyrexia: All Will Be One Commander #35)
Core Set 2019 Checklist (Core Set 2019 Tokens #CH1)
Counsel of the Soratami (Champions of Kamigawa #55)
Devious Cover-Up (Guilds of Ravnica #35)
Dictate of Kruphix (Journey into Nyx #37)
Disdainful Stroke (Guilds of Ravnica #37)
Divine Gambit (Strixhaven Mystical Archive #67)
Dungeon Master (2016 Heroes of the Realm #2)
Eradicator Valkyrie (Kaldheim #94)
Faerie Tauntings (Lorwyn #112)
Gut, Devious Fanatic (Alchemy Horizons: Baldur's Gate #13u)
Haunt of the Dead Marshes (The Lord of the Rings: Tales of Middle-earth #90)
Invert // Invent (Guilds of Ravnica #228)
Jarl of the Forsaken (Kaldheim #100)
Karlach, Tiefling Spellrager (Alchemy Horizons: Baldur's Gate #14u)
Kiki-Jiki, Mirror Breaker (Jumpstart 2022 #79)
Lash Out (Lorwyn #183)
Lonis, Cryptozoologist (Modern Horizons 2 #370)
Lore Drakkis (Ikoria: Lair of Behemoths #194)
Lotus Path Djinn (Fate Reforged #39)
Magnus the Red (Warhammer 40,000 Commander #131)
Maximize Altitude (Guilds of Ravnica #43)
Mistfire Adept (Fate Reforged #42)
Monastery Siege (Fate Reforged #43)
Mystic Retrieval (Dark Ascension #42)
Mythos of Vadrok (Ikoria: Lair of Behemoths #127)
Nicol Bolas, the Ravager // Nicol Bolas, the Arisen (Core Set 2019 #218)
Nicol Bolas, the Ravager // Nicol Bolas, the Arisen (Core Set 2019 #218)
Otharri, Suns' Glory (Phyrexia: All Will Be One Commander #3)
Palladia-Mors (Secret Lair Drop #1071)
Palladia-Mors, the Ruiner (Core Set 2019 #219)
Rakshasa Deathdealer (Khans of Tarkir #192)
Rally for the Throne (Throne of Eldraine #25)
Reap Intellect (Dragon's Maze #95)
Sarevok, Deceitful Usurper (Alchemy Horizons: Baldur's Gate #9u)
Tajic, Legion's Edge (Guilds of Ravnica #204)
Temple of Deceit (Theros Beyond Death #245)
Tezzeret's Gambit (Strixhaven Mystical Archive #84)
The Cauldron of Eternity (Throne of Eldraine #82)
Thraben Heretic (Dark Ascension #26)
Vhal, Candlekeep Researcher (Commander Legends: Battle for Baldur's Gate #102)
Vhal, Scholar of Mortality (Alchemy Horizons: Baldur's Gate #8b)
Vhal, Scholar of Prophecy (Alchemy Horizons: Baldur's Gate #8u)
Weave Fate (Khans of Tarkir #61)
Wyll of the Elder Pact (Alchemy Horizons: Baldur's Gate #15u)

This search is finished. Now the real work can begin.