Whenever you cast a spell, add . Until end of turn, you don't lose this mana as steps and phases end.
Creatures you control can boast twice during each of your turns rather than once. // Discard a card: Exile the top two cards of your library. You may play those cards this turn.

"This is a tale to make all Kaldheim tremble..." // Like her well of stories, Birgi's horn never runs dry.