For simplicity sake,  keep to the current state of the ban list, which I'll be sure to include a link to in the OOC.

As for power level... somewhere between Duel City and Arc V; it's real magic again,  and you're fighting real monsters,  but what you're doing is supposed to be secret, so escalating to summoning a big monster that's knocking buildings down right away is discouraged within the setting, even though it's technically an option.