One my favorite cards from the art to effect I just love this card 5
The most common pairing is Numa, Joraga Chieftain, but I prefer Thrasios, Triton Hero (one of Magic's best merfolks) or Tana, the Bloodsower for a better color identity
Elsa - The Fifth Spirit #48 (Lorcana Shimmering Skies | Lorcana Cards) prices are based on the historic sales
The thing is, losing life is easier than gaining (and much more dangerous)
The last way white lends aid to your mana base is by helping you tutor (search your library) for lands (often Plains cards), and adding them to your hand
Since it has storm, you get a token copy of the aura for each previous spell cast, letting you buff your whole team or stack multiple auras on a single threat