The news comes from the Wall Street Journal (which should, by itself, give you an idea of how big this is), which was tipped off that the card has been registered and graded by PSA, the authentication and grading company
Being a two-color deck with red in it also means you can potentially maximize a more focused package of planeswalkers, leaning into Chandra or Gideon kindred
Teferi, Who Slows the Sunset is probably a romantic, but thats not all that relevant to their abilities
Its uniquely strong in a deck that can clear its path with discard spells and protect it with a healthy suite of creatures and removal spells
This list is also a long one, even cutting cards off my list
For one black and one white, this is a 1/3 creature that gives you the ability to pay one blue and two colorless to copy creature cards you discard