Is it possible to damage my team with Brimstone ult? If so what is the best way to kill my entire team with Brimstone ult? I need this information to avoid killing my entire team

So we know that the costs of vp is high/low for some, so it would have been good if they added discount or something during huge festivals, and we also know that vp is not always the greatest since they are not buyable at a significant cost...