14 cards where the text includes “persist” and the colors ≤ GU

Aerie Ouphes (Eventide #65)
Antler Skulkin (Eventide #167)
Cauldron of Souls (Commander Anthology Volume II #180)
Glen Elendra Archmage (Ultimate Masters #58)
Grazing Kelpie (Eventide #153)
Lesser Masticore (Modern Horizons #225)
Night Brushwagg Ringmaster (Unfinity Sticker Sheets #3)
Persistent Petitioners (Ravnica Remastered #53)
Rattleblaze Scarecrow (Shadowmoor #259)
River Kelpie (Commander 2019 #93)
Startled Awake // Persistent Nightmare (Shadows over Innistrad #88)
Startled Awake // Persistent Nightmare (Shadows over Innistrad #88)
Trapjaw Kelpie (Eventide #164)
Wingrattle Scarecrow (Shadowmoor #270)
Woodfall Primus (New Capenna Commander #322)

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