20 cards where it’s legal in Commander and the color identity ≤ BUW and the card has the keyword “Constellation”

Archon of Sun's Grace (Commander Masters #814)
Boon of the Spirit Realm (Commander Masters #720)
Captivating Unicorn (Theros Beyond Death #6)
Favored of Iroas (Theros Beyond Death #15)
Harvestguard Alseids (Journey into Nyx #13)
Pious Wayfarer (Theros Beyond Death #32)
Skybind (Journey into Nyx #25)
Protean Thaumaturge (Theros Beyond Death #60)
Sage of Mysteries (Theros Beyond Death #62)
Shoal Kraken (Theros Beyond Death #65)
Thassa's Devourer (Journey into Nyx #53)
Triton Waverider (Theros Beyond Death #78)
Whitewater Naiads (Commander 2018 #112)
Agent of Erebos (Journey into Nyx #59)
Daxos's Torment (Commander 2015 #18)
Doomwake Giant (Duskmourn: House of Horror Commander #138)
Dreadbringer Lampads (Commander 2015 #122)
Grim Guardian (Journey into Nyx #73)
Thoughtrender Lamia (Journey into Nyx #85)
Underworld Coinsmith (Commander 2015 #237)

It is the moment of discovery, the triumph of the mind, and the end of these results.