When do the stats calculate? Like, if you had no cards in your hand, would the unupped Wolfpack die on attack or just be strange and have 0 | 0 until the next turn?
I used the same "mechanics" of Scarab, to count stats at the end of the turn. I'm not sure to fully understand your question, since in game we already have 0 HPs creatures (like Phase Salvagers or Balls) that, without buffs, die on attack.
So, it's pretty easy to understand that, if you end your turn without cards, this creature will die on attack as well (if no buffed in another way, of course).