Well, yeah they take off that attack point for the aura. Consider, Sen'jin passes the vanilla test, has taunt also and is a fucking common! Then they add another effect to Nullifier and feel they need to detract a stat point.
Now this, which islegendaryis losing four full points from vanilla to add those two effects? One of which is available on a common minion for free, and both are on Nullifier for only a one point penalty. How does this make sense? What makes this thing legend status then?
Now, trading into a Nullifer is a much different prospect than trying to trade into a 5/9 for sure. But its still vulnerable to silence and TBK, and they make it cost fucking nine? Why? Because of ramp/sea witch sort of shenanigans?