Krenko is a canny goblin who runs a flourishing organized crime syndicate and has ties to the shadowy Mr. Taz. He is quite expert in infiltrating various guildhalls and other strongholds. He infiltrated the Boros Legion to retrieve feathers from one of the angels.
Later, he used a magical portal to gain entrance into Orzhova. He entered the quarters of the Ghost Council, which was not in session at the time. He acquired some valuable but unknown object from the Ghost Council. When the guards arrived, he sprinted through the halls, leading them through a seemingly pointless chase. He was finally cornered in the Grand Library, where he took a thrull as hostage. When it was obvious that no one cared about the thrull, he assaulted the guards, set off a bomb, and vanished.
Whether Taz is the true leader of Krenko's gang or his own agent is yet to be determined. However, Mr. Taz is likely one of the many aliases of Lazav of the Dimir.
"He displays a perverse charisma fueled by avarice. Highly dangerous. Recommend civil sanctions." -Agmand Sarv, Azorius hussar
Goblins are eager to follow orders, especially when those orders involve stealing, hurting, annoying, eating, destroying, or swearing. (Krenko's Command)
"We won't sit like lazy gob-slugs waiting for death to come to us. We'll bring death, shiny sharp, to our enemies." -Krenko, mob boss (Fervor)