The Zyra build for Support is Liandry's Anguish and Arcane Comet. This LoL Zyra guide for Support at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Zyra Counters
Zyrawinslane against...
Win Rate
Matchup Rate
Janna
2361 games
3.3%
Alistar
1341 games
1.9%
Soraka
2214 games
3.1%
Braum
720 games
1.0%
Renata Glasc
1926 games
2.7%
Nami
2405 games
3.4%
Rakan
3194 games
4.5%
Rell
1181 games
1.7%
Lulu
2489 games
3.5%
Sona
1038 games
1.5%
Milio
1851 games
2.6%
Thresh
4530 games
6.4%
Blitzcrank
2206 games
Leona
1818 games
Taric
437 games
0.6%
Shaco
569 games
0.8%
Nautilus
2720 games
3.8%
Seraphine
1401 games
2.0%
Maokai
795 games
1.1%
Bard
1888 games
Morgana
2615 games
3.7%
Karma
2183 games
Ashe
1884 games
Tahm Kench
444 games
Pantheon
539 games
Neeko
Yuumi
1476 games
2.1%
Brand
1751 games
2.5%
Swain
1240 games
Zilean
931 games
1.3%
Heimerdinger
402 games
Senna
5540 games
7.8%
Lux
4435 games
6.2%
Zyraloseslane against...
Xerath
2598 games
3.6%
Vel'Koz
972 games
1.4%
Pyke
1966 games
2.8%