Soraka is a powerful ally in battle, using her strong healing to keep the party moving forward.
You can use Wish on your allies from across the map to save them from otherwise fatal events.
Equinox can be used as a powerful zoning tool to keep enemies at bay.
Focus on attacking Soraka when she ever ventures to the frontline to heal her allies.
Take advantage of Soraka's long cooldown on Equinox if she uses it to harass.
It's easier to focus Soraka than the ally she is healing.