17 cards where the text includes “isn't legendary”

Aeve, Progenitor Ooze (Modern Horizons 2 #148)
Auton Soldier (Doctor Who #36)
Double Major (Strixhaven: School of Mages #179)
Hall of Mirrors (Unfinity #216a)
Helm of the Host (Dominaria #217)
Irenicus's Vile Duplication (Commander Legends: Battle for Baldur's Gate #78)
Miirym, Sentinel Wyrm (Commander Legends: Battle for Baldur's Gate #284)
Nanogene Conversion (Doctor Who #49)
Ob Nixilis, the Adversary (Streets of New Capenna #206)
Osgood, Operation Double (Doctor Who #191)
Quantum Misalignment (Doctor Who #52)
Spark Double (Ravnica Remastered #62)
Storm of Saruman (The Lord of the Rings: Tales of Middle-earth #72)
Stunning Strike (Commander Legends: Battle for Baldur's Gate #97)
The Apprentice's Folly (Wilds of Eldraine #200)
The Sixth Doctor (Doctor Who #159)
Yenna, Redtooth Regent (Wilds of Eldraine #219)

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