Surprising result looking at dragons win rate:

Teams with 2 Cloud Drakes have a better win rate than teams with 2 Infernal drakes.

We see the same trends with x3 drakes, although the sample is a bit small.

We can also note that stacking Cloud/Infernal drake give better result (+8% win rate) than Mountain/Ocean (+3%).

Is Cloud Drake secretly OP ? What do you think ?

Update:

As people mention it on twitter, most of the time, Cloud Drake are killed for free by the dominant team. I n order to understand the above numbers, I tried to add more context by looking at the gold lead at 15 min:

Tim Sevenhuysen also write a piece on Drakes priority where he looked at drake differential at 20 min: http://oracleselixir.com/2017/05/elemental-drakes-value-priority/