Temporary Taric Buff

At least until his rework (which has been hinted at might be next year) I was thinking that Taric could play a very specific role in the support cast. To do this I think his W could use a change. You see when he uses Shatter he loses some of his armor but so too does his allies as his aura is based on his armor. I was thinking that he not only shatters his own armor but that of his allies too but to create areas of high concentrated damage to discourage diving or encourage diving. Let me put up my idea:

Passive: Taric's gemstones increase his Armor by 10/15/20/25/30. Additionally, nearby allied champions gain 0.12 Armor (12% of Taric's Armor). Active: Taric detonates the gemstones gathered around allies and himself dealing 40/70/100/130/160 (+0.2 armor) magic damage to each enemy caught in the detonation and 50% damage from detonations around allies. (Damage stacks). For each detonation an enemy is caught in they have their armor reduced by 4/8/12/16/20. While Shatter is on cooldown Taric's Passive is not active

This would make Taric a great pick against assassin heavy comps that like to dive deep into enemy teams and comps that favor melee bruisers and a strong front line. He works very well with a strong front line on his own team as multiple tanky members up front can easily stack sets of detonations heavily shredding armor and dealing some decent damage.