I actually prefer the least murdery routes possible. For example, I collect flowers adn stuff to sell, which lead me to discovering that if you have yarrow you can talk to Migo and leave peacably, and then you can send Magister Yarrow to him, and the two talk. The downside of course is that I have to give the healing ring to Yarrow to get there.
Still, if I get yarrow flowers and stuff quick enough I can use that ring to heal sparkler card dude too, I suppose.
But murder = tons of exp.
Does he eat the Yarrow flower? Or does it remains in his inventory. Because if he eats it, rip recyclable Elixir for great gold.