The Nilah build for ADC is Navori Quickblades and Conqueror. This LoL Nilah guide for ADC at Platinum+ on 13.24 includes runes, items, skill order, and counters.
Nilah Counters
52.0%
(-1.7%)
62.8%
(+0.2%)
3.5%
(-0.0%)
4.9%
(-1.3%)
685
(-35)