Minecraft village dragon

What if there was a room that you could dig into under the centre of every village, and there you would find a dragon. You could tame this dragon with an emerald. The dragon would follow you and protect you wherever you go.

The dragon would fight monsters for you like a tamed wolf would. When you find the dragon it would not hurt you. Also, you would be owner of the village, but if you hurt a villager the dragon would kill you.

Please put this in the game!