I got The Hand of Mercy in 2015 shortly after HW launch, SMN was overpowered and I was getting 7-15 kills every match. If I'd farmed it now I'd switch to a bard, it has melee-quality LB every 90 seconds called Barrage, if you pop all buffs and focus a target with 70-80% hp (except tanks) you have a guaranteed kill.
Machinist is good too with Between the Eyes wreckage every 2 minutes but it relies on target not being immune to stuns/binds and it's harder to play, especially on controller.
I don't play black mage much but I guess Fire4-Fire 4-Firestarter should kill someone too.
Melee is out of question unless you have a pocket healer.
