Back when zergs were mostly random classes I used to be able to fight zergs in my full berserker thief. Cluster bomb was 1200 range and then some when you detonated the projectile. Using Signet of Malice with the stability from Dagger Storm would let you push into a middle of a zerg by yourself. Then you could always port back to safely with the unlimited range, no cast time sword 2 skill.