User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-82.158.185.52-20121110135409/@comment-82.158.185.52-20121110141413

Also, they said it was good for Mana Tanks, and the soft-removal of Frozen heart makes me wonder if Sheen and Glacial Shroud could get to work together, as a more agressive-ish mana-armor item, and then a sepparate item with the attack speed debuff, maybe manaless, who knows.

Also, since some tanks have medium-long cooldowns, which may reduce the efectiveness of this item, maybe some sort of new condition (damage taken or something) may be added along with the after-spellcast one.