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I don't think that 4 orbs are enough, maybe  {Stifle} as a 3-of

 {Descendants' Path}
It looks quite broken, but how to abuse it?
My first guess was in a bant miracles build, using cards like  {Temporal Mastery} in order to
Get to 3 mana, the decks could run {Nest Invader} and  {Emrakul, the Aeons Torn} combined with  {Sensei's Divining Top} to cheat it out as early as turn 2

I really don't like drain life and the obliterators.
This decks is quite soft to combo, and you need to be able to find the torpor orb in order for any of your cards to make sense. Maybe splash white for  {Enlightened Tutor}. I like  {Orim's Chant} as a sideboard option. Chrome Mox is quite important because your
key combo piece is 2 mana. I think that this has a shot at being competitive just because of the sheer power of the deck