User blog comment:Slashingstrike/Vampirizer/@comment-15077371-20160827161416/@comment-3391671-20160828232355

"most on hit effects are actually attack speed based items so the attack speed component makes perfect sense"

- Slashingstrike

Flawed argument in that you justify a stat because other items in the same "category" offers the same effect. That would then justify that based items should have an accompanying defensive component, which is not always the truth. I believe both mechanically and thematically, the AS is not needed.

In truth only half of on-hit effect items have innate buff, and none of them offer it both as an innate part and in part of the passive effect ( doesn't have innate AS, but a passive AS buff).

Contrary to what Iffem is worried about, I believe that this item does scale into the late game. Maybe not as good as other on-hit effects, but with the extra 10% damage + life steal, it's adequate enough.

Life steal is a percentage aspect and doesn't provide bonus damage. Your "Life Stolen" mechanic may not be a prevalent aspect in many items, but the effect itself is more powerful than simple life stealing. At first, it's only flat in Vampiric Sword, but becomes a large percentage item with Vampirizer (effectively of  and about  of ). of Health Stolen should effectively be if not more (since it deals damage and applies life steal).

The calculation for flat Health Stolen isn't easy as A + B all divided by 2. If one has 85 AD, this item would effectively provide 15% life steal. Of course, the more AD the champion has, the flat value becomes less effective, but let's take into consideration when this item would be purchased and how efficient in cost it would be to receive 15 true damage on-hit.
 * = 20% life steal =
 * = 15% life steal =
 * = 12% life steal =
 * = 10% life steal =

Early on, just having 15 on-hit true damage (which is more worth than 15 on hit physical/magic damage, maybe per point, thus  total) is a good amount of damage; the Health Stolen only makes 1 point of true damage even more effective. From what I would infer, 1 point of Health Stolen is worth at least (assuming that in most cases, the champion will have about 110 AD when they switch out Vampire Sword for Vampirizer).

Taking into consideration the above, Vampire Sword is worth. Vampirizer would be worth 2050 with only the two innate aspects, another 1200 more because of the 20 flat Health Stolen damage and more from the 10% AD damage. This would make Vampirizer, as mentioned, overly cost efficient since it already outdoes itself with only the innate stats and the flat Health Stolen damage. I don't want to even consider how cost efficient the other aspects of the ability is...