The Sylas build for Mid is Everfrost and Conqueror. This LoL Sylas guide for Mid at Platinum+ on 13.18 includes runes, items, skill order, and counters.
51.7%
(+0.1%)
48.2%
(-0.2%)
7.8%
(+0.7%)
10.7%
(+2.0%)
785
(+5)