User blog comment:Deshiba/Mana Items./@comment-3493296-20140924145645/@comment-4022742-20140925110614

So it gives 200% base damage like it does now. And on top of that it will give 100% of your total AD or AP? That's way to severe and broken. This would give AD carries over 800 ad for 1 attack every 2 seconds. Calculation for the total damage on Vayne's tumble with your set up: This would result in a total damage of 937,5 damage, of which the majority gets doubled during a crit. Vayne getting the ability to 1 shot a carry with 1 critically stuck tumble is not ok.
 * "100% full attack damage as physical or 100% AP as magical."
 * Base AD + Sheen: 217
 * Full Build: 245
 * The Blood Thirster - 100AD
 * Infinity Edge - 80 AD
 * Last Whisper - 40AD
 * Trinity Force - 25 AD
 * Boots - 0AD
 * Defensive item - 0AD
 * Tumble modifier: 122
 * Trinity force modifier: 108,5+245=353.5

In order to do this you'd have to change what it's made out of, seeing as Sheen gives 25 AP and Aether whisp gives 30AP. Uncombined they give 55 AP and when you pay money to turn it into lich bane you only get 30AP? That's incorrect.
 * "Lich Bane should then also give 30 AP and 40 MR."

I didn't specifically mention this, but I lowered the AP that Lich bane gives in my version from 80AP to 60AP, that way the 250 more mana actually gives less damage then the 20 AP did, Essentially it's an overall nerf.
 * "As for Ryze, just reduce his ratios a bit, to like 6% and 4% and it will be fine."