Ghast Spider

What It Does
It is a baby ghast that you can ride around, its not a spider, though. It can probably attack other mobs, but I haven't figured it out. The caveats is that it probably can't attack.

Appearance
The egg's appearance is white, unlike other spider eggs. The weird thing that it does not show any signs that its a spider, it's just working for you. It is a mini/baby ghast that you can ride around.