33 cards where the card is tagged “rainbow-land” and the color identity ≤ R and it’s legal in Commander

Ancient Ziggurat (Conflux #141)
Archway Commons (Strixhaven: School of Mages #263)
Azor's Gateway // Sanctum of the Sun (Rivals of Ixalan #176)
Azor's Gateway // Sanctum of the Sun (Rivals of Ixalan #176)
Brotherhood Headquarters (Assassin's Creed #80)
Bucolic Ranch (Outlaws of Thunder Junction #265)
Cascading Cataracts (Dominaria United Commander #202)
Cavern of Souls (The Lost Caverns of Ixalan #269)
City of Brass (Double Masters 2022 #321)
Command Tower (Duskmourn: House of Horror Commander #96)
Corrupted Crossroads (Oath of the Gatewatch #169)
Dowsing Dagger // Lost Vale (Ixalan #235)
Dowsing Dagger // Lost Vale (Ixalan #235)
Forbidden Orchard (Double Masters 2022 #323)
Forsaken City (Planeshift #139)
Gateway Plaza (War of the Spark #246)
Gemstone Mine (Dominaria Remastered #247)
Glimmervoid (Double Masters #319)
Golden Guardian // Gold-Forge Garrison (Rivals of Ixalan #179)
Golden Guardian // Gold-Forge Garrison (Rivals of Ixalan #179)
Grand Coliseum (Commander 2016 #299)
Lotus Field (Core Set 2020 #249)
Mana Confluence (Journey into Nyx #163)
Meteor Crater (Planeshift #140)
Pillar of the Paruns (Double Masters 2022 #328)
Primal Amulet // Primal Wellspring (Ixalan #243)
Primal Amulet // Primal Wellspring (Ixalan #243)
Rainbow Vale (Masters Edition #179)
Rupture Spire (Commander Legends #355)
Secluded Courtyard (The Lost Caverns of Ixalan Commander #350)
Spire of Industry (Murders at Karlov Manor Commander #296)
Tarnished Citadel (Odyssey #329)
Thran Quarry (Urza's Saga #329)
Three Tree City (Bloomburrow #260)
Transguild Promenade (Commander Legends #499)
Unclaimed Territory (The Lost Caverns of Ixalan Commander #366)
Vivid Crag (Commander Anthology Volume II #276)

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