i'm don't like it...
ah.. no i'm don't meaning i'm don't like this card but i don't like your idea about flying weapon form.
animate weapon is air right? that's why i'm think it should still be creature even if you use nimble again when it already be creature, not turn into permanent again, that make animate weapon freely useless.
what about don't change it into permanent? and so many shield from can stack it defence power?