Even at this early stage the deck has a lot to offer, possessing a searcher capable of seeking out Therion spell and trap cards in Therion Lily Borea and a monster that can negate effects in Therion King Regulus
Not only do you get a damage ping for each spell cast, but Vivi starts to grow and then gives you access to a bunch of extra mana, probably enabling your bigger spells for the blue/red archetype
Some of those attackers are Gardevoir CRE that can OHKO anything with its Brainwave attack or Zacian V CEL which can OHKO anything with its Storm Slash attack
"Oh my gosh, this is crazy," he added once the auction closed and confetti rained down
But then you can turn them into mana producers
Sacrifice Golgari contains plenty of sacrifice outlets like Grist, the Hunger Tide and cards that produce sacrifice fodder like Compy Swarm and Creakwood Liege