User blog comment:SirAston/Thoughts and suggestions regarding Summoner Spells/@comment-5545048-20130808153408/@comment-3297251-20130808154752

Barrier counters Ignite, that's why it overshadows Heal.

Your idea is good, maybe making it restore a percentage of your and your allies missing health over time (so that tanky champs can benefit from it too). Heal is not too bad tbh, there are just better alternatives to it. Nerf them, and Heal will be more viable.