If a spell moves itself into another zone as part of its resolution (as Teferi's Protection, All Suns' Dawn, and Beacon of Unrest do), rebound won't get a chance to apply

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So, if the Fatal Push destroys the creature the Bituminous Blast was targeting, you wouldnt get to choose a new target for the Bituminous Blast
And while each card you draw after that still raises the odds of seeing Ob next, they wont raise the odds nearly as much as if your deck was built to 60 cards
You can see and rearrange your card pool as time allows
Its been more common for WotC to create new subtypes than main types