Perdition's Blade never really seen play so I don't see why this would be. Sure this can do 8 damage and Perdition's Blade 6 damage but that's not that big of a difference. And that 2 damage from Perdition's Blade combo can kill something without taking face damage. You are overratting this card.
as I said before tempo rogue is nearly perfect. u can't cut waggle pick even for this 3 mana 4/2 (which is freaking strong). if they release some op rogue or neutral card surely we can find a spot though.