Will M. Baker
Can anyone explain how the bloodhound card works? (e.g. multiple heroes/bloodhounds attack calculation)
Is this correct?
3 bloodhounds + 1 hero = 9 extra attack? (3 x +2 attack, + 3 x +1 attack)
If I have 2 heroes will the total extra attack power offered by the hounds remain the same? ("at least one hero")
Your math is correct. Each Bloodhound would get both Dungeon bonuses, or +3 per Bloodhound. Each Bloodhound only cares that here is at least one hero present, and at least one other Bloodhound present; its bonus does not increase if there are additional heroes and/or Bloodhounds present beyond that.
If the bonus increases as the target card increases in quantity, the ability will be templated with "...for each...", as in Forcemage Shaper's "Add Magic Attack +1 for each spell present", which will increase in potency as the number of spells present increases.