hummm that looks like a nuke but it seems to be a mix of a nuke that rams 2 radioactive material to gather and a implosion based one so all in all not a good bomb design but could work.
Marble: With the correct amount of powdered poison joke and enough fuel to enable a high-altitude detonation, I could be a massive dick to more than just everypony at school. I COULD BE A MASSIVE DICK TO THE ENTIRE COUNTRY! MWAHAHAHAHAHA!