It may have started as a Standard sideboard card, but it still shows up in Commander mill decks that want their win condition to be fast and inevitable
Final Judgment in another, just because they served their respective stories in different ways
Looking at Primal Genesis, it has 12 lands that come into play tapped (here I'm counting Terramorphic Expanse and Evolving Wilds)
Not only will you have a creature with infinite power, but you will also be able to cast any colorless creature for free repetitively
In their article describing the creative craft of Final Fantasy x MTG, WotC's Dillon Deveney principal narrative game designer for the Universes Beyond team says that Optimistic and Hopeful was one of the design pillars when setting Final Fantasy s tone
Its an excellent application of a famed bit of D&D loot, and should be fun to surprise opponents with in a pinch