This is a build i found in one my ranked games, and tried it out it out by finding our game on op.gg. The enemy sona was oneshotting and shredding us all with 350+ stacks of dark harvest and full build and mejais. I tried it, and it worked. I have played it in ranked and it works in bronze.

This is really easy to play, like all supports. The small difference is that this build offers flexibility between being an op healer and an assassin to get rid of a 18/0 Vayne decimating your team. You goal early: farm souls from you dead adc and cannons and heal.
Just don't steal any CS as you adc will tilt and you won't get souls from him anymore. Mid game start roaming with your team and teamfights oughta break out. You just need to stun, heal, and run if you loose with you E. And throw in a few Q's and empowered autos. Do the same late, but this time with you SPAM THE LIVING **** outta your Q and focus on autoing adc's.
That's it. Thanks for reading guys! <3