Read up on you're history then:
http://wow.gamepedia.com/Valeera_Sanguinar
Also I am excited to see what spells she will have.
Can take down enemies with a poison trait, and use her spells with the combo.
Valeera Sanguinar Melee Assassin (Cloaked) Warcraft Hero
Would be nice too if she had
Q: Fan of Knives (Switches to Cheap Shot while stealthed),
W: Shadowstep (Perfect for ambushing enemy Heroes/units and also can be used on friendly heroes and units to get away),
E: Feint (Dodges the enemy attacks for fifty chance for five seconds...Can increase the dodge with talent, and good with dodging spells from Heroes incoming apoun you) ,
R:; Death from Above
Not sure yet that would be good for the other ult or it would be nice if she didn't have two ults.
Then with D or the main trait can be:
Trait: Leeching Poison (Add this poison to increase your damage to the enemy)