33 cards where the text includes “heroic” and the color identity ≤ RUW

Akroan Conscriptor (Born of the Gods #87)
Akroan Crusader (Ultimate Masters #121)
Akroan Line Breaker (Journey into Nyx #88)
Akroan Skyguard (Born of the Gods #3)
Anax and Cymede (Theros #186)
Arena Athlete (Ultimate Masters #123)
Artisan of Forms (Theros #40)
Battlefield Thaumaturge (Journey into Nyx #31)
Battlewise Hoplite (Theros #189)
Chorus of the Tides (Born of the Gods #33)
Dawnbringer Charioteers (Journey into Nyx #6)
Elite Skirmisher (Born of the Gods #8)
Fabled Hero (Theros #12)
Favored Hoplite (Theros #13)
Hero of Iroas (Ultimate Masters #20)
Labyrinth Champion (Double Masters 2022 #115)
Lagonna-Band Trailblazer (Journey into Nyx #14)
Leonin Iconoclast (Journey into Nyx #16)
Meletis Astronomer (Born of the Gods #43)
Mindreaver (Born of the Gods #44)
Phalanx Leader (Ultimate Masters #27)
Rosnakht, Heir of Rohgahh (Dominaria United Commander #25)
Sage of Hours (Journey into Nyx #50)
Satyr Hoplite (Journey into Nyx #110)
Setessan Battle Priest (Theros #29)
Tethmos High Priest (Ultimate Masters #40)
Triton Cavalry (Journey into Nyx #55)
Triton Fortune Hunter (Theros #69)
Vanguard of Brimaz (Born of the Gods #29)
War-Wing Siren (Journey into Nyx #57)
Wavecrash Triton (Theros #74)
Weird Angel Flame (Unfinity Sticker Sheets #42)
Wingsteed Rider (Double Masters 2022 #35)

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