I thought everyone knew about this... Been using it to farm false gods for over a year.
Sure it's a little suspect, but as long as you don't use it for pvp I see no harm. And if you do use this for pvp well... lets just say that a purify won't save you against blarp when you start 6 cards down.
You can go lower than 24 cards if you have any glitched malignant cells, alt chimera, or marks. Although as it involves selling them you better either be very rich, or be very sure about what deck you want to use. I find it works best on voodoo doll OTKs.
Edit: Please move to report a bug section.
You mean confirmed bug section. 8)