User blog comment:Lukeatlook/Pyro's Item Overhaul 4 - Welcome To The Jungle/@comment-8802138-20140412084345/@comment-4813965-20140412095130

takes over the role of Feral Flare, giving access to on-hit damage to champions right away, but without the small AD bonus and the free ward.

It starts with 20 on-hit damage to champions, so you need 13 camps to get it to the level of the current Flare (which is pretty similar to how many camps junglers need to do after Wriggle's right now).

The lack of 12/15 AD in there is actually fairly significant, since most champions using Flare have some sort of AD ratios on spells. Even if they don't, it's 15 less on-hit damage, so you could say Bloodrazor's power spike is around nerfed Flare (30 stacks needed on PBE).