magnet spell

A spell which , when dropped in a area will create a magnetic field which attracts attackers troops to go towards at first. The magnet just attracts the troops it its effective area and then leave them there to destroy the building there . once its effect goes , the troops start breaking nearby buildings ... If there are buildings and walls between the target and the troop , except hog . breaks the way building first . hope you like my idea

It has been suggested many times. And maybe the suggestion is not attracting players out. Negative vote from me.