I haven't heard of any such "Brick", probably doesn't exist.
The i3-8250k is only worth it if you plan on overclocking, for which you will need a decent aftermarket cooler. I would recommend the the i5 8400 is you don't have much experience overclocking and would probably recommend it otherwise as well. I would urge you to go for an Asrock Z370 board tho, as you could BCLK OC the processor (I've done it by very little on an MSI Mobo, will be much better on Asrock as they properly support it)
As for the GPU, if your are running a decent one at the moment, I would probably wait for it, if your dont have a PC or just have an older GPU go for the RX 580 instead. With the release of the i5 8400, i would not consider an Ryzen 1600 over it at all.