Massacre Wrum from Mirrodin Besiege. After the Phyrexians invaded Mirrodin they started converting many natural species that inhabited the plane with their phyrexian oil, one such creature was a Quilled Roaring Slagwurm one of Mirrodins' most ferocious creatures.
It's speculated that the specimen the Phyrexians used to create the Massacre Wurm was already decaying when they introduced the oil to it. Massacre Wurm's presence would drain the life and rot anything that got to close, in the same way it was Mirrodin's most ferocious creater it became New Phyrexian's most powerful weapon and it's best example of Phyrexian completion.
I wanna also give a special thanks to @royalfoils for supplying me with high quality foils. Thanks man! .
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