This ties into Magics Adventure mechanic, with some new rules to add extra wrinkles
Heck, theres probably a great Naya Dragons deck with Thunderbreak Regent and Draconic Roar as one-of, if not the only non-creature spell in the deck that works off of the creature-mana produced from Shaman of Forgotten Ways and Beastcaller Savant
Its a nightmare for blue decks, and it synergizes beautifully with other cards in Rakdos Midrange or Yawgmoth lists that love incremental value and pressure
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an overload cost), add any cost increases, then apply any cost reductions
Assemble the Shiniest of the Shards of Alara Block
And finally Champions of Kamigawa