Shadowfang Sword WoD drop rate increase?

The Shadowfang sword (which requires level 19 to equip and drops from Shadowfang Keep) is one of the most valuable items in classic WoW due to its very low drop rate and it's high demand for twinking.

The drop rate has constantly been changing (lower drop rate) every expansion. However, in Warlords of Draenor I have heard rumors that the drop rate for this item has increased.

Questions:

What is the drop rate currently at?
What mobs/bosses drop it?
Is there a difference of drop rates between bosses and mobs? If so what is it at?
Expected amount of runs through Shadowfang Keep to actually get a chance of seeing it?

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How rare is Shadowfang?

So in conclusion: Shadowfang is pretty damn rare, with about a . 009% drop rate.

Where does the shadowfang drop?

Shadowfang is a one-hand sword with a Shadow damage proc and additional Shadow damage that is a Zone drop in (appropriately enough) Shadowfang Keep in Silverpine Forest.

How many runs for Shadowfang?

Shadowfang and Assassin's Blade.

Why You Should Goldfarm In SHADOWFANG KEEP | Shadowlands Goldmaking

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