Being in Mardu colors grants you a ton of options for sacrifice fodder
The key thing to using this spell is to know when to sit on it and wait for an opportunity to win, when to use it proactively to take out even just one player, and when to use it defensively and forgo the chance to use it to try and win
If Machine God's Effigy copies a planeswalker that became a creature due to an effect, Machine God's Effigy will have that planeswalker's loyalty abilities but its only card type is artifact (it will still be legendary in most cases)
While I respect this definition, I prefer the more chaotic version of chaos: decks that completely mess up the way the game is played
Running this combo requires you to run a bunch more mana rocks though, because you need to be able to produce at least 2 mana off of the rocks just to get the engine going, plus more mana if you want to produce infinite mana off of the combo
If you prefer not to run tutors, you can always play Troubled HealerTroubled Healer or Trenching SteedTrenching Steed instead