2nd turn, dagger (killed his 1/1 token)
-Shadowstep > Defias
-shadowstep > defias
At the end of turn 3:
I have a 6/6 Adventurer, a Defias 2/2 and 3 defias 2/1 minions, plus a dagger
He follows with 2 damage to all minions, but it doesn't even matter.
Turn 4, a couple no cost spells and 2 cold bloods later, and... K.O.!! (well, he was down to 4 health and just quit)