Tank Varian is a great Taz'dingo counter

Level 7 Live by the Sword reduces W cd if you get auto attacked, which you will get from Zuljin, a lot. Level 4 shield wall prevents all damage. So as soon as a Zul'jin uses Tazdingo all you have to do it use Taunt + W and his ulti is nullified. Your W cd is now also heavily reduced because he attacked you. Level 20 Vigilance now also suddenly becomes viable due to the high AS of Zuljin attacking you while taunted at low HP.