The Olaf build for Top is Stridebreaker and Conqueror. This LoL Olaf guide for Top at Platinum+ on 13.24 includes runes, items, skill order, and counters.
Olaf Counters
53.0%
(-0.4%)
54.4%
(+0.2%)
2.5%
(+0.3%)
2.0%
(-0.2%)
816
(-29)