The Sylas build for Mid is Everfrost and First Strike. This LoL Sylas guide for Mid at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Sylas Counters
Sylaswinslane against...
Win Rate
Matchup Rate
Aurelion Sol
1439 games
1.1%
Annie
793 games
0.6%
Swain
788 games
Ekko
1928 games
1.5%
Katarina
3865 games
3.0%
Veigar
2483 games
1.9%
Kassadin
1936 games
Azir
4047 games
3.1%
Fizz
3777 games
2.9%
Syndra
6364 games
4.9%
Lissandra
2087 games
1.6%
Vladimir
2163 games
1.7%
Galio
1067 games
0.8%
Viktor
2399 games
1.8%
Ahri
5769 games
4.4%
Twisted Fate
2967 games
2.3%
Qiyana
1165 games
0.9%
Xerath
1889 games
1.4%
Zed
5263 games
4.0%
Ziggs
1046 games
Sylasloseslane against...
Yasuo
5587 games
4.3%
Akshan
1282 games
1.0%
Yone
7538 games
5.8%
Malzahar
2418 games
Zoe
1550 games
1.2%
Vex
2871 games
2.2%
Akali
9119 games
7.0%
Vel'Koz
705 games
0.5%
Irelia
2295 games
Neeko
1565 games
Cassiopeia
1452 games
Diana
1310 games
Pantheon
1352 games
Talon
2254 games
Jayce
Taliyah
1458 games
LeBlanc
2442 games
Anivia
1153 games
Naafiri
1496 games
Ryze
1252 games
Orianna
10033 games
7.7%
Lux
2171 games
Tristana
1035 games