The Milio build for Support is Shurelya's Battlesong and Summon Aery. This LoL Milio guide for Support at Platinum+ on 13.24 includes runes, items, skill order, and counters.
Milio Counters
Miliowinslane against...
Win Rate
Matchup Rate
Alistar
1718 games
2.0%
Renata Glasc
3222 games
3.7%
Rell
1633 games
1.9%
Shaco
643 games
0.7%
Maokai
765 games
0.9%
Leona
2077 games
2.4%
Milioloseslane against...
Senna
6003 games
6.9%
Vel'Koz
897 games
1.0%
Xerath
2198 games
2.5%
Neeko
919 games
1.1%
Zyra
2791 games
3.2%
Pyke
2541 games
2.9%
Zilean
1206 games
1.4%
Lux
4352 games
5.0%
Brand
1552 games
1.8%
Bard
2513 games
Swain
1257 games
Morgana
2805 games
Karma
2655 games
3.0%
Yuumi
1877 games
2.1%
Pantheon
602 games
Ashe
2286 games
2.6%
Seraphine
1479 games
1.7%
Thresh
5733 games
6.6%
Sona
1204 games
Taric
587 games
Blitzcrank
3066 games
3.5%
Nautilus
3833 games
4.4%
Nami
3270 games
Braum
1037 games
1.2%
Lulu
4304 games
4.9%
Soraka
2714 games
3.1%
Rakan
4718 games
5.4%
Janna
3186 games
3.6%