Here's another one-mana common, but this time it's a removal spell that would definitely fit any Aristocrats deck.
There is also a possibility of fitting it into a more combo-oriented sacrifice deck that generates damage by killing off your own creatures. It's the kind of deck that uses Cruel Celebrant and Mayhem Devil.
This means that Spark Harvest will find its way into several different lists that run a lot of sacrificeable tokens/creatures.
But even if you don't have anything to sacrifice on the battlefield, then paying four mana for a removal spell is a totally fair deal.