Just want to point out that Vayne can proc Duskblade with her ult like 5 times.
"After being unseen for at least one second, your next basic attack against an enemy champion does 45-300 bonus damage." Meaning, when you Tumble with Vayne ult, not only do you get the extra 50 AD when your ult is popped, but you also get the Bonus AD from your Q proc. AKA, you can one shot a squishy target 5 times because you can continuously proc Duskblade for it has no cooldown on its passive. Imagine a build like this:

She already hit's me for 2/3 of my health with one Q Ult auto with
, let alone her getting that extra 300 bonus damage every second when she Tumbles. Riot, for the love of fucking Christ, but a cooldown on the passive.
Amateurs...