Man I haven't played YGO in ages...
So due to that, I don't know too much about the current metagame. I've heard that L&D Dragon decks have been the new standard amongst players, so I guess that makes sense on why it was put to Semi-Limited.
It seems Gadgets got a huge boost, so I expect that they'll be the new CC once these rulings take effect.
I find it interesting that they brought back Monster Reborn. I think you might be right in that its purely for experimental purposes Brian, so probably it'll go back in the next ban list (which I believe is September/October time?)
Raiza and Advanced Ritual Art I understand too, especially with all the Demise decks and the new Rituals that you mentioned before Brian. I don't know anything about the usage of Ojama Trio that warranted Limited use (I know the card effect), so that's a cloudy subject for me to bring up.
Eh, more work to be done now if I ever create another deck
-Sean