Malady

Now builds from Dagger + Amplifying Tome + 545 gold(1400)

+25 ability power
+25% attack speed
Unique Passive: Your basic attacks deal 20 bonus magic damage and reduce magic resistance by 6 for 8 seconds (maximum 4 stacks).

Nashor's Tooth

Now builds from Stinger + Malady + 400 gold(2890)

+75 ability power
+50% attack speed
Unique Passive: 20% cooldown reduction
Unique Passive: Your basic attacks deal 30 bonus magic damage and reduce magic resistance by 6 for 8 seconds (maximum 4 stacks).

Folding Malady's passive into Nashor's Tooth and making that upgrade path available will make it a strong niche item choice for champions that could make use of both AS and AP, including a certain moon-based champ that's coming up.

I kinda like the 25% CDR, 55% AS and mana regen.

Plus, putting the two together might be altogether too powerful, particularly on carries like Varus or Ezreal who deal good magic AND physical damage.

I'm interested in the part where the two items combined lose 15% attack speed, and an arbitrary 50 AP is gained. Shouldn't those two stats be swapped? 75% attack speed and 50 AP?

I like my 25% CDR!

Nashor's Tooth and Malady are fine as is.

I do think Malady could be fun if it built into something- I've always thought maybe Malady and Ex's Calling could do something. However, I also think Nashor's should be left alone- after all, it's a stronk item for AP Teemo.