Here is why i like to do so after experimenting a few games :
I like to go extremely defensive early until about 5-6 mana where i start to flip hard on the offensive side, i have a few cards that use 1-2 mana that have taunt who i use as basically ponds until the game progresses. I always Armor Up! until the 5-6 mana point. I stacked my deck with lots of 0-2 mana cost cards such as execute, whirlwind, cleave, etc to make sure i can be competitive at the start while taking as little damage as possible.
All of my minion cards have either battlecry ability charge or taunt, (mostly battlecry) so i can make my guys as beastly as possible (still stacking armor if possible) "warsong commander" seems to be a must, allys having charge !? OP
i don't really know what else to say i haven't though this through LOL share your tactics and experiences!