The Maokai build for Support is Trailblazer, Knight's Vow, and Locket of the Iron Solari. This LoL Maokai guide for Support at Platinum+ on 14.3 includes runes, items, skill order, and counters.
53.6%
(-0.4%)
44.9%
1.9%
(+0.2%)
1.2%
(+0.4%)
435
(+2)