A Call to Arms indeed delivers some interesting heroes - Theoden could bring Rohan back to the front again, as a swarm deck benefits from cheaper allies. And his weapon is quite a hammer for a Spirit hero. And Treebeard is also very interesting - provides very good attack or quest for a few life points, which you can easily repeat in Lore. The only downside is that I then have to think about which Treebeard I want to play, because the ally version is also very good. But for example Aragorn or Elrond with Athelas brings him back on his feet quickly after he briefly went amok. Ok, 13 threat is heavy, but on the other hand, this could be a real Lore fighting machine.