If the target Treasure is an illegal target as Discerning Financier's last ability tries to resolve, it won't resolve
There are traditional versions of characters, known as Storyborn, but the Lorcana universe also contains bold reimaginings in the form of Dreamborn or Floodborn. Dreamborn game cards feature glimmers that have been infused with Lorcanas magic and reimagined in novel ways
If you wanted to replicate that Draft experience in Cube form, you'd usually build a Cube consisting of one copy of every rare and mythic, two copies of every uncommon, and three copies of each common from DMU
Imagine an opponent has spent 10 minutes putting together a huge turn and just cast Finale of RevelationFinale of Revelation to draw their entire deck and end the game on the spot
Doubling Seasons effect is often imitated but ironically, never duplicated by later doubling enchantments the open-ended wording which allows for instant Planeswalker ultimates will probably never appear on another spell
Really, the only thing holding Riku back is its additional cost to copy those creatures and spells