Asura gives advantage by battle, which is one of the only ways that you can remove a mass amont of monsters (this explains the aggressive meta). Right now there are only a couple of cards that have a high enough power level of being played (Torrential & Mirror). A couple of months ago when we had Dark Hole, you probaly would never see Asura.

I haven't seen Asura Priest used very much at all lately...aside from possible tech, but even then it was mainly used for "Chaos Food" u_u

It probaly won't see much play out of chaos, as it's not really a "dominating card."

And since there's not really that much massive swarm where it'd make too much difference (at least not without any different results from other cards)