In those situations, its just a colorless land, which isnt that bad
Sorry in advance!
Like most Magic: The Gathering cards, the value of Spark Rupture depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (March of the Machine: The Aftermath)
Also remember that if your cube is sleeved, then you'll need a bigger box to accommodate
Ceremonious Rejection can be sided into any deck that can reliably have one blue mana open by turn one or two, and it stops colorless spells cold
Getting 2/2s simply for playing Magic is a strong ability on its own, and opens up options for mana ramp, Voltron (making 1 creature super strong through powerups), Curses like Curse of Opulence for table politicking, and several other cool, unique effects that Auras can bring to the table as you build a token army