Vishgraz makes a fine inclusion in the 99 of an Ixhel, Scion of Atraxa deck, but its just outclassed by the angel in most ways
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As a fine card on its own and one that's incredibly strong with other Humans on the battlefield, this is a great example of what you're looking to play in these kinds of decks
With access to that piece of the puzzle guaranteed, you could more or less fill the rest of the deck with good ETB effects and call things done
When two cards (for example, Fang, Fearless l'Cie and Vanille, Cheerful l'Cie) are melded, the result is a single permanent (in this case, Ragnarok, Divine Deliverance) that's represented by two cards
Its cool that it actually changes land types, which matters in some odd cases