The number to the left of each ability is the impact that ability will have on your Planeswalker's Loyalty
Those facts make Torpor Orb or Null Rod choices not based on what your deck does, but what you can reasonably expect the other decks to do and wanting to prevent it (and sometimes, even if youre doing it yourself)
So in my opinion, an educated guess would be at least 3x and up to 6x more 1st Ed than unlimited for Mysterious Mountains
If you control three or more treasure (thats the bounty you get from being a good hunter), youll turn it into Yiazmat, Ultimate Mark, a powerful 5/6 with upside
Theyre more vulnerable than regular creatures since anything that destroys either type can remove them, but that just means they enable twice the synergies
You also get the chance that one of the common cards will be replaced by a premium foil card of any rarity, one of which is foil