While not reading as a conventional tank, Captain Reve can do the job through crowd control alone.  With a permanent slow around him and a solid mass stun on his ultimate, he also heals while attacking controlled targets, making him a hard defender to break. Reve also does some surprising damage, especially in a Cultist team, where he enables the Lord bonus for basically everyone. He's such a great tank in so many situations that I almost didn't mention the gold buff.