Build path on Nashor's tooth sets the buyer up for failure
Let me be more specific. I think the biggest problem with nashors tooth is it is an item build by AP champions. The item itself offers many favorable stats, including a worthy amount of ATS and AP and CDR as well as a passive you might use. There are a select few champions that build this item and if most of them are observed one may notice that there is only one aspect of them that utilizes this ATS; they have a passive ability that does damage with auto attacks and the player is seeking to enhance that ability by geting nashor's tooth. however, it is only this one ability that scales with ATS, besides this they actually may have good AP scaling with the rest of their abilities. which leads us to the problem.
If the player chooses to buy nashor's tooth, they can choose to buy the fiendish codex if they would like to increase the damage of all their abilities OR they could buy stinger which will increase the effectiveness of only their auto attack based passive. So lets say that both players in mid lane recall with 1250 gold. One of them will get
for an impressive 60 AP OR if they are building Morello's, which I believe has a wonderful build path, they might get
and
OR
and
while the other can get either this
or a combination of
and
. In conclusion, the player who doesn't build the nashor's tooth will always have more ability power sooner.
Perhaps it should be stinger + fiendish codex + amp tome
stinger + blasting wand + amp tomb
Recurve bow + fiendish codex + amp tomb
please be encouraged to share your opinions below. please be logical : D

- gives Attack speed, 20% CDR (10% from both items) and AP.. quite a lot of AP for just a Codex being built into it..
is more good for mages who don't use their Auto attacks.