User blog comment:Hamengeri/Outrageous Runic Blade (Custom Item)/@comment-10779726-20130825140820

There's a reason that people don't want to build things like Tear of the Goddess and Manamune on AD Casters and some AD Carries and such: because they need the mana but it delays their build.

This is intentional on the part of the game developers. If Mana costs were negated with that kind of passive (Chalice of Harmony Version) champions like Caitlyn, Ashe, Graves, Miss Fortune, Urgot, Varus, and many others could constantly shove their lane and poke down their lane opponent whenever they felt like it without having to worry about mana costs or much retribution.

The Glacial Shroud Version would make your trading completely broken. You get mixed damage as well as armor to negate your opponent's damage. Champions like Kog'Maw would have a field day with the AS and extra mana this gives.