Bah, get death trooper and hope to trigger that tenacity up before DT goes, then bomb the S*** out of that tenacity up and increase cool downs with nihilus, that means now Rex will take 5 turns to get tenacity up again, I sometimes even leave the guy if there is someone more dangerous in the team ^_^
Edit: why does no one talk about DT??? He's a very solid toon that you don't need to Zeta unless you use krenick, I love him, since I got him in my arena squad I focus hitting those triple cleanse teams ^_^