When fighting Zero, it says discard 3 cards that cost 0 recruit points to fight him. I assume that is all I need to do since he costs 0 attack? Also, do wounds count as 1 of the 3 since it has been stated Wounds have a cost of 0?
And you can't count cards discarded for Smash or Berserk or any of the other card effects that create discard possibilities. Zero has his own cost independent of other cards you play or villains you fight.