A Thousand Cuts: Melee Dual Wielding Attack. Deals +1/+3/+5(W) damage. You gain +15/+30/+45 doublestrike, +15/30/45 Melee Power, 15 seconds. Cooldown: 90 seconds.
WHY?
You are potentially getting +5[W] AND also Doublestrike AND Melee Power...for 15 FREEKING seconds its not a one and done like most attack clicks... It should be expensive. Well worth the cost for the duration IMO (the only thing is the cooldown should be ~45 seconds as 90 is excessive as a tier 5)