Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is my guide for sona.
As you can see below it works :P
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The main thing is to support your allies.
Try to place your ulti right if they wanna gank allies.
And keep spamming your heal.
Boots of swiftness --> for early movement.
Rod of ages --> for the hp and ap and this way it can load all of its passive
Spirit visage --> for the buff heal on yourself and the hp
Innervating locket --> for the hp and nice passive ofc :P after this item you are amazing
Zhonya's ring --> for the ap ofc :P to boost your heals
Soul shroud --> for the hp and cd reduction so you can spam more heals :P
Just try it out and i will see ya comments :P
And plz before you do a -1 give me a comment :P