20 cards where (the text includes “enter” and the text includes “the” and the text includes “battlefield”) and the colors ≤ BRW and the set is “stx” and (the rarity is equal to common or the rarity is equal to uncommon)

A-Dueling Coach (Strixhaven: School of Mages #A-15)
Archway Commons (Strixhaven: School of Mages #263)
A-Tenured Inkcaster (Strixhaven: School of Mages #A-88)
Biblioplex Assistant (Strixhaven: School of Mages #251)
Brackish Trudge (Strixhaven: School of Mages #65)
Campus Guide (Strixhaven: School of Mages #252)
Dueling Coach (Strixhaven: School of Mages #15)
First Day of Class (Strixhaven: School of Mages #102)
Lorehold Campus (Strixhaven: School of Mages #268)
Pilgrim of the Ages (Strixhaven: School of Mages #22)
Pillardrop Rescuer (Strixhaven: School of Mages #23)
Prismari Campus (Strixhaven: School of Mages #270)
Professor of Symbology (Strixhaven: School of Mages #24)
Quandrix Campus (Strixhaven: School of Mages #271)
Returned Pastcaller (Strixhaven: School of Mages #224)
Silverquill Campus (Strixhaven: School of Mages #273)
Spiteful Squad (Strixhaven: School of Mages #237)
Star Pupil (Strixhaven: School of Mages #30)
Tenured Inkcaster (Strixhaven: School of Mages #88)
Witherbloom Campus (Strixhaven: School of Mages #275)

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