The Malphite build for Top is Kaenic Rookern, Thornmail, and Hollow Radiance. This LoL Malphite guide for Top at Platinum+ on 14.3 includes runes, items, skill order, and counters.
Malphite Counters
53.3%
(-0.0%)
46.1%
(-0.5%)
5.6%
(-0.3%)
11.2%
(+0.4%)
708
(+6)