Reducing the cost of your spells grants some much-needed advantage in spell-heavy decks (read: Storm), especially if you plan on casting expensive, game-ending spells like Insurrection
Its also good at stopping random combo decks: Yawgmoth, Belcher, Oops, Underworld Breach etc
Aside from that, they have great potential in maintaining their toolbox strategy, keeping their hand always with a good amount of cards, which "Tragoedia" would fit because besides its high attack, it can manipulate Levels for your non-"Constellar" Xyz (except "Ptolemy M7"), not to mention controlling your opponent's monsters, with this archetype that has various Levels
Singularity Rupture This has me thinking of Alrunds Epiphany where combining a control effect with a wincon can prove quite powerful
but then I remembered the extraordinary number of Pokemon cards that we have just floating around our house
This purchase is good for 1 sealed booster box of Shiny Treasure