Within your deck you can only have up to four cards with the same name, and the only exception to this is energy cards, which you can have as many as you like
Delve is a fantastically strong mechanic in any format with cheap spells and fetch lands, and getting the best two out of seven cards with no drawback is a huge advantage
It pairs beautifully with cards like Leonin Arbiter or Ghostly Prison, which already strain resources
As far as I can tell, there's no difference in rewards between the two, it's just a tacit acknowledgement that you're up against opponents who'll probably know their stuff, or not
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