This is not a very good deck, fair warning. This is a pile of goofy synergies that is a lot of fun to play around with :V
I'm sure you have given dawnwalkers killer before, but what about brushstalker? It turns its drawback into a huge advantage, letting you kill off men every time your opponent plays a spell! Even sillier is ephemeral wisp, which turns legitimately terrifying with a xenan cultist on board. Twinbrood sauropod even has synergy with the killer spells, since we are running dark return.