Plot twist: The money to spawn comes from other people randomly. Eventually people start reporting vanishing money at the same time that people hear news of a man randomly raining money wherever he goes. This immediately sparks controversy and religion, as the country begins to destabilize and the economy grinds to a halt.
The government gets together and decides that changing the currency to a new note, so as to avoid it being conjured away and raining somewhere east of Massachusetts, is the only solution forward.
This has an unexpected blowback, as the superpower is to spawn money, not useless green paper. The rain immediately changes to the new currency.
Discovering this loophole, the government changes the currency to bowling balls in the hope to have the problem solve itself.
You now randomly hail bowling balls around you and the local bowlingalley owner is a tycoon. You killed ten pin bowling. I hope you're happy you bastard.
Andrew Bailey, governer of the bank of England, actually has this super power and why inflation is running away in the UK. Turns out spawning lots of money has ramifications elsewhere. Can I argue the Bitcoin creator had this super power too? No, fair enough
A bit, yes, definitely, but that's been going on since 2008, and inflation is running away now because the energy generators got heavily on the iTs wArTimE bandwagon and saw that they were getting away with it. Other companies got in on the same act and corporate profits have never been so high, ever.
Quantitative Easing is why the stock market didn't crash early and often and the gap between rich and poor got much, much wider.
So the Bank of England in my view enabled crisis inflation a bit, but it was the energy generators that really pushed the economy into maximum fleece the little guy mode. Raising interest rates won't fix it because disposable income isn't the problem. It's rampant profiteering that's the problem.
The ability to cure any disease/illness or unwanted mental disorder/illness in anyone nearby within a certain radius. Might as well focus on it helping others if it's completely random.
Instantly getting the (positive) effects of a full 8 hour sleep. Would be nice to just randomly get a boost in energy, or sometimes not have to worry about sleeping.
Movie-grade intelligence and/or hacking ability. Can be pretty normal most of the time then go on binges of doing really cool things and just kinda be perceived as a genius eccentric.
Inverting the adverse condition from having no control over when it activates to include conditions about it only activating in a specific place seems to solve a lot of the malicious compliance type side effects. Given that it seems to be a malicious compliance type scenario, it can't be ruled out that that the final ace-up-the-sleeve would be that it never activates.
With those axioms, I'd probably go with something like: "activate 'creative mode' while sitting at my computer in my place of residence"
That way whether or not it actually engages, it's in a favorable location where my body is occupied and generally no harm comes to it beyond sitting in one place too long. If it never activates, who cares? If it does, yay! :3