sword of the Paruns is ok but you are more likely to get the infinte combo if you add umbral mantle and ashnod's altar. not to mention umbral mantle is a 0 equip cost, which sometimes lets you start the combo 1 turn earlier. You should also check out thornbite staff which pretty much is the the best card you could have for Krenko EDH.
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The deck is decent but far from perfect. I'd suggest to add Skirk Prospector, Ashnod's Altar, and Umbral mantle. Then you'll have Krenko's infinite goblin combo