43 cards where the text includes “threshold” and the color identity ≤ GRU and (the card is available on Paper) and it’s legal in Commander

Barbarian Ring (Modern Horizons 3 #299)
Centaur Garden (Odyssey #316)
Cephalid Coliseum (Modern Horizons 3 #300)
Trained Blessed Mind (Unfinity Sticker Sheets #44)
Aboshan's Desire (Odyssey #59)
Nimble Mongoose (Modern Horizons #174)
Kamahl's Desire (Odyssey #199)
Seton's Scout (Torment #138)
Shoreline Looter (Bloomburrow #70)
Thought Shucker (Bloomburrow #77)
Werebear (Dominaria Remastered #182)
Anurid Barkripper (Judgment #104)
Chlorophant (Odyssey #234)
Demoralize (Odyssey #184)
Far Wanderings (Zendikar Rising Commander #66)
Krosan Avenger (Odyssey #247)
Krosan Restorer (Dominaria Remastered #168)
Mindwhisker (Bloomburrow #60)
Nantuko Blightcutter (Torment #131)
Nightwhorl Hermit (Bloomburrow #62)
Seton's Desire (Dominaria Remastered #176)
Centaur Chieftain (Eternal Masters #160)
Cephalid Sage (Eternal Masters #41)
Chainflinger (Odyssey #181)
Fledgling Dragon (Modern Horizons 3 #280)
Krosan Beast (Odyssey #248)
Nantuko Calmer (Torment #132)
Otarian Juggernaut (Odyssey #305)
Pardic Arsonist (Torment #105)
Springing Tiger (Odyssey #272)
Swirling Sandstorm (Judgment #102)
Battlefield Scrounger (Dominaria Remastered #150)
Epicenter (Odyssey #192)
Excavating Anurid (Modern Horizons #163)
Grizzly Fate (Judgment #119)
Lightning Surge (Judgment #96)
Metamorphic Wurm (Odyssey #250)
Shower of Coals (Odyssey #221)
Thermal Blast (Odyssey #224)
Crashing Centaur (Odyssey #235)
Nut Collector (Dominaria Remastered #171)
Kamahl's Sledge (Torment #102)
Stone-Tongue Basilisk (Odyssey #276)

The arc of my blade has carved a path of light to the end of these results.