On another note, there is a heated debate going on about Crucible of Worlds being too powerful because it can go in any deck and create a soft lock with strip effects. I was working on my own version of this deck recently, and I wondered: Could Crucible of Worlds work well in this deck like they say?
Blood moon is good
against the soft lock you describe. So that alone might make blood moon worth running. If your mana base can handle it, that is. So it fits into r/g really good.
The crucible lock is good, but it needs other cards (strips, fastbond, zuran orb) to function, where blood moon does not. And blood moon is an enchantment, where crucible might get hit by "splash damage".