[Idea] The range spell

Hello guys, What do you think of the concept and the idea for a new range spell. This card can be like the rage spell but instead of increase speed it would increase attack range. For example, imagine a musketeer near by the bridge, next you drop the rage spell and the musketeer starts to shoots the tower.

Obviously is not a perfect concept because what would be the effect of the range spell in melee troops like the knight and the Valkyrie?

What do you think of this idea? please let me know in the comments.