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Is it okay to use it normally

You can Book of Moon your own monsters to protect them and still contact fusion using them, you just have to reveal them before you contact fusion to confirm they are the correct fusion material (that is unless Konami has changed this ruling since then)

And third, this is really what synergizes most readily with your commander

Once it rotates from Standard, it will never see play again, unless there is a need to have a fifth or sixth Oblivion Ring in a deck (that's an interesting deck to think about)

If you see someone playing Black and having a card stuck face down for almost the entire game, it might be Haunting Voyage