Each time you cast a noncreature spell, you are essentially netting yourself an extra mana each turn thanks to Vivi's first ability
Its a simple but elegant loop
Illumineers Quest: Palace Heist comes ready to play with 2 pre-built decks, Jafars deck, a cardboard game board, deck boxes, damage counters, game components, and a container box
You get to have the trigger for life loss, they lose a creature, they lose more life, you get a creature back, and then at end of turn you get something good back from your yard
You could probably get this deck up to Bracket Three standards by including some better Equipment cards, but this deck doesn't really have what it takes to make it up to Brackets Four or Five without such a major overhaul that it wouldn't even be recognizable anymore