It looks expensive and unreliable, and yet I see it in alot of lists. 6-9 is good, but really swingy 10-13 is very situational 14-17 is usually bad. Do you auto-lose if you don't have reserve points? 18 is great, but hard to roll. What is the thing I'm missing? It just seems too widely variable (even with a Slann) to be relied upon.