It seemed like a weird brick with a single button on one side, and on one of the edges was a switch with 2x on one side and .5x on the other... Appropriate word being was as the switch seemed broken. Fractured, dented, and seemingly both sides were pressed in at the same time. It was a curious remote-like device, and went to the store owner up front who didn't seem busy.
"Hm, oh yeah that one. An apprentice of mine had developed that one." The owner said "If the switch was flipped on the 2x side then if you focus on any thing or aspect then it would double, and if it was on the .5x side it would half. He called it the Doubler/Halver... He wasn't known for his naming, but it was accurate."
You asked "But the switch is kinda... Well broken seems like the right word."
"Yeah, we did a few tests and whatever happened to the switch is unfixable. At the same time the damage hasn't made as catastrophic a change as they sometimes can."
"What? Does it change people's genders now?"
"Nah, if you want that one it'll cost a few hundred dollars. In fact the damage probably made things a bit better for newer people for transformations. Instead of selecting whether you want to double or half any aspect of anything, well you select the aspect to double or half and then the remote will double it half the time or half it half the time. So if you keep using it on the same thing statistically it'll go back to normal. Plus the randomness can be fun."
You took out your wallet and said "Well I think it could be interesting. This was 75% off right?"
The owner/cashier said "Yes, since that was originally an apprentice's work... It's currently $20... What sure it's a little broken, but it's still a magic item that can do some really amazing things. $20 is a steal."
A $20 spent later you had the weird magic item and now had to think about what you'd use it on first.