Dragon's already really strong, this seems oppressively strong.
Most notably, THAT SUSTAIN on the first dragon. Sustain is so strong. Notice how a small increase of 30 max healing on Hecarim's W against minions/monsters changed him from an off-meta pick (who played jungle more than top) in to one of the highest banned champions in Diamond + play, and plays primarily top, with over a 53% win rate top. All for 30hp on a 20 second cooldown.
Now, I AM exaggerating. He also got some mana buffs, and frankly was sleeper strong before the buffs.
Regardless though, the point is that in laning phase sustain is REALLY strong. Sneaking a dragon pre-10minutes would basically guarantee every lane wins hard.