*points to avatar*
But seriously I don't really think it needs to be nerfed, yes it can be very powerful, but it's fairly easy to counter, you can usually see it coming since they're typically pulled into the support zone before the player using them attacks.
(Since if a player holds them in the command zone or hand until the attack in order to be surprising then they've lost resources they could've used on abilities and will therefore have a weaker attack)
Since it doesn't have untouchable and the player using it will want to keep it out of battle until they attack it can be hit with called shot pretty reliably, if not assassinated, hunted or banished.
With only 6 health you can kill it with fight, or it can be pulled to the assault zone with word of command/ferocity (or Ireul) and killed by one of your units, it can also be killed through aoe damage, or pretty much anything that can target cards in the support zone.
Plus there's cards like humble to make it lose its ability or altar of binding to keep it in the support zone.
If it's in the command zone sure it's harder to deal with but there's still plenty of cards that can mess with it, like assassinate.