mtg vault cards Ultra III — Put two +1/+1 counters on each creature you control thats a Zombie or Mutant. Magic The Gathering Mirrodin Single

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)

If this strategy gets into the long game, then include a card like Raise the Past and get right back to attacking

This creature not only makes your instant and sorcery spells cost one less to cast, but by sacrificing it you can copy the next instant or sorcery spell you cast that turn - and not just once, but for each time you've cast your Commander from the command zone in that game

That makes it quite a nice support fatty in decks which can reliably sacrifice this such as Recurring Nightmare or Sneak Attack

40 creatures and 20 lands is the opposite of what you want to be playing Sin Collector against