Sunny Days Entertainment Equines

Sunny Days Entertainment released a white unicorn with multicolor hair under the series name Blue Ribbon Champions in 2023; later the same year, they released the Glam-R-Ranch collection, which appears to use the same mold as the Blue Ribbon Champion. This is the Midnight Rainbow unicorn (7.25″) with light-up horn and sounds, and hair accessories:

Blue Ribbon Champions Unicorn Grooming Set (stock photos):