From there, I checked known flavour texts on gatherer from the Scriptures (since the one on the art was the Dark Ritual text) and I found this on Phyrexian Altar:
[quote]"Unskin these impure bodies, Great Yawgmoth, that the flesh may welcome your blessings."
"Great Yawgmoth moves across the seas of shard and bone and rust. We exalt him in life, in death, and in between."
Yawgmoth(tentative, differs from recorded usage)