The Aphelios build for ADC is Infinity Edge and Fleet Footwork. This LoL Aphelios guide for ADC at Platinum+ on 13.24 includes runes, items, skill order, and counters.
Aphelios Counters
47.8%
(-0.1%)
45.3%
4.8%
(+0.4%)
0.7%
(-0.0%)
755
(-39)