Quote from The Lord of Tresserhorn »I don't quite follow this logic... I mean, as soon as Overwhelming Splendor lands on you, she will lose all abilities and you'll not move it to anyone else and get your cards. So it's completely stupid to play Overwhelming Splendor when she's out... I don't feel you need to set her color identity to prevent players from playing that total non-bo?
Maybe they tweaked her ability specifically to not work with OS and they also transitioned her colors to Grixis separately but whoever said that conflated the two