Mulligans
Aggro Mulligans
If you are playing against Murloc Shaman or some kind of hunter you can keep those cards in your mulligan.If you have galvanizer or crystology you can consider keeping bronze gatekeeper or zilliax (ony one of them!).
Midrange Mulligans
Against mech decks or mirror matchups owl will be our saviour keep it.If it is a druid dont keep the owl.