The Sona build for Support is Echoes of Helia and Summon Aery. This LoL Sona guide for Support at Platinum+ on 13.19 includes runes, items, skill order, and counters.
Sona Counters
Sonawinslane against...
Win Rate
Matchup Rate
Janna
210 games
2.2%
Braum
120 games
1.3%
Rakan
372 games
3.9%
Alistar
245 games
2.6%
Nami
412 games
4.4%
Milio
171 games
1.8%
Shaco
93 games
1.0%
Soraka
445 games
4.7%
Maokai
61 games
0.6%
Renata Glasc
135 games
1.4%
Lulu
386 games
4.1%
Rell
131 games
Sonaloseslane against...
Senna
553 games
5.9%
Xerath
338 games
3.6%
Zyra
391 games
Zilean
123 games
Twitch
49 games
0.5%
Lux
557 games
Heimerdinger
51 games
Vel'Koz
72 games
0.8%
Neeko
98 games
Swain
159 games
1.7%
Pyke
336 games
Brand
187 games
2.0%
Blitzcrank
307 games
3.3%
Taric
86 games
0.9%
Pantheon
97 games
Bard
262 games
2.8%
Karma
349 games
3.7%
Yuumi
258 games
2.7%
Leona
219 games
2.3%
Morgana
214 games
Nautilus
464 games
4.9%
Thresh
678 games
7.2%
Seraphine
181 games
1.9%