Caduceus Winery, Arizona. These are the wines of Maynar James Keenan singer of TOOL. Maynar is actually owner of Merkin Vineyards and Caduceus Winery in Arizona. He is following the steps of his grandfather who was a winemaker in Italy. Caduceus winery produces wines under several labels. Learn more about Arizona wines watching the documentary "Blood into Wine" featuring Caduceus winery.