Would I gain 10,000 life if I were to use this:
On this:
Not possible since the Chaos flags prevent size 30 or greater monsters from being destroyed by effects.
It is possible on Negulbalz though, to deal 10000 damage to your opponent if you manage to destroy Geargod
Yeah, but at least the damage can be prevented.
All size 30s are indestructible by card effects.
What do you think?