In a recent Good Morning Magic! video, Senior MTG Designer Gavin Verhey explains why WotC designed this card. In a traditional Booster Draft, you don't have to worry about matching your color identity with your Commander, but in Commander Legends, it would be a huge risk to switch colors if you don't have a Commander that match your deck's color identity. To fix this issue, they had to create a basic legend originally named Florm, which is now called Prismatic Piper. So if a player doesn't succeed in finding a matching Commander, they can always use Prismatic Piper because you can choose its color identity.
Watch the video below:
Commander Legends product and events will be available on Magic Online on Thursday, November 19, 2020. It will be available globally on November 20, two weeks after its original launch date.