Is this team compositional viable ?

So , I would like to play a ranked 5 v 5 game with my friends and I would like to know if this team composition would be viable :

Amumu jungle vladimir top Orianna mid soraka , nami , morgana or thresh support Miss fortune or graves adc (Maybe include somehow kennen in this team composition ?)

I am not sure about the bans , but Janna will be one of the bans for sure . The only problem I see in this team comp would be having 4 people playing ap champions . Tactics : play safe early game and get dragons , search for teamfights in mid to late game . Any opinions or ideas to inprove this team composition?