Please use script images.
Project link: http://scratch.mit.edu/projects/16039137/
Script:
I want the butterfly bullet to show only on the winter backdrop. How do i do this?
When i click space in level 1: do not do anything with the butterfly.
When i click space in level 2: use the butterfly.
Help needed.

Hey MasterCard.

First off, I really liked your project. It looks like it is coming along quite well.

To solve your problem. Try this modification to the butterfly's scripts: put an “if” block inside the “When space bar pressed” script. Like so:

when [space bar v] key pressed
if <(backdrop name) = [winter]> then
    point in direction ([direction v] of [Wizard v])
    show
    repeat until <touching [edge v]>
        move (25) steps
    end
    hide
    go to [Wizard v]
end

Tell me if this solves your problem. If not, shoot me a reply and I will try to help more.