Quick note on Duskblade of Drakthar Gold Efficiency
So here is the calculation of the gold value. For reference, AD is 35 gold per point, armor pen is 40 gold per point, and % movement speed is 39.5 gold per point.
75 * 35 + 5 * 39.5 + 10 * 40 = 3222.5 gold
Divide that by its actual value, 3250 gold, and you get 99% gold efficiency with that ridiculous passive.
I've done the math, you're welcome, the item is in fact broken.