Back in the days we used to troll GMs at conventions with stuff like that. Can I cast invisibility or cloak? Can I use levitation? And roughly how large rock c

Back in the days we used to troll GMs at conventions with stuff like that. Can I cast invisibility or cloak? Can I use levitation? And roughly how large rock can I create with a create element earth spell? Alright, so my character's name is Northrop, and let's bomb some cities.