Magic: The Gathering has specific ways it represents story elements through its gameplay, and I'm happy to see that these mechanics were translated so well to create an authentic-feeling Final Fantasy experience that goes much deeper than Cactuar's 9999 damage ability
When you take the initiative, or it you have the initiative at the beginning of your upkeep, you venture into the Undercity, which is a specific dungeon
Normally, Cardsphere users send their unwanted cards to other users, which accumulates a sort of bank roll thats then available to other players to send cards to you from a curated wants list
Being able to counter problematic multi-colored cards for a single colorless mana will be a great effect anytime a counter to colorless strategies exists as a multi-color option , and Null Elemental Blast will have the unique effect of making sideboard decisions that much more difficult based on its mere existence in Modern
Putting the land into play untapped makes these really strong