The Problem with Cloud Drake
The issue I have with cloud drake is that the buff doesn't have a impact on most champions that get it. All the other dragon buffs either makes you stronger at something your good at or make weaknesses less noticeable/exploitable. Cloud drake however mostly makes champions who already good roamer, splitpushers, or teams that want to rotate better while having little impact for everyone else. Champions tend to either be either good or awful at those things and that's due the nature of their kits/playstyles which isn't changed with out of combat move speed. Giving it in combat move speed keeps the idea of what cloud drake is supposed to represent, which is speed. But becomes more useful to all champions.