Morgana is one the best blind and counter pick to most supports. Morgana can be very scary when you can land most of your Qs. In early laning phase, your Q can set up an easy kill or zone. Pair with champions like Swain in botlane, after Morgana lands her Q, Swain can follow up with his passive + his root to get an easy kill. In team fights, I usually use E on my front line to engage and save up my Mikael's to free my carry from any CC. All the games I've played with Morgana, if you can land your Q most of the time, you can win the whole game.