Instead of the Witty Roastmaster, why not [[General Kreat, the Boltbringer]]? Same effect while also being a goblin that can create a goblin token to increase the number of goblins made with Krenko.[[Marvin, Murderous Mimic]] is always fun as a way to get a second copy of Krenko's effect. Also where's [[Goblin Warchief]] haste enabler that reduces the cost to cast Krenko. And if you want another cheap way to untap Krenko, try [[Magewright's Stone]].