Forum:Yubel Rulings

I was curious on the rulings of Yubel with Hand of Nephthys. The page on Yubel decks says you can tribute Yubel with the effect of Nephthys but is that different from tributing, say, Caius the shadow monarch to destroy yubel, which I don't believe works.

So, overall, does using Nephthys effect allow me to summon Yubel - TI?

Also, does tributing Yubel for Cauis allow me to summon Yubel - TI?