i don't dr boom, or even naxx
my pure-mech mage made rank 9 the first time i even attempted to climb with it
doesn't mean it won't lose tempo a lot

that's all i was saying.
it's fine to put in an owl but coghammer is definitely "necessary" for that particular deck's intended archetype.
he's missing a lot of cards, i'd just play a yolo face charge deck and godbless farm rank 20 until the deck's finished.