If using a castle esc Mamba pro version it may look like this.

The esc is capable of a 6S lipo so if we wanted a 50,000 rpm motor then divide 50,000 / 22.2 volts = 2252 kv motor. I would select a motor of appropriate size with a 2000-2500 kv and then use the largest 6S battery that'll fit in the tray.