User blog comment:Hamengeri/Outrageous Runic Blade (Custom Item)/@comment-5883057-20130824191202

Combining the chalice version with the : let's count.

If you constantly attack, your mana will stagnate @ 40%, at which point you deal 6%*40% + 2%*60% = 3.6% of your max mana damage and lose 3%*40% - 2%*60% = 0 (as I said earlier, it stagnates at this point). Anyway, given that you almost always end up with at least 2000 mana, you deal 72 bonus damage without any cost...

... Besides the 5030 gold you spent.