Gratz, mayne!
What have you been using - mech? As a shaman, do you feel like you're usually avoiding overload?
I play mech shaman. I run crackle, lava burst, doom hammer as overload cards and I really try to save those until I have lethal. Although, I do frequently play the doomhammer on turn 5, which usually sucks because then I can't fire ele or fel reaver on 6.
Ideally, you draw all the mechs, and then draw the burn spells later and use them for lethal, and never pay the overload price!!!
However in practice I found it to be just a worst version of mech Mage