Looks pretty solid, but I think Threatening Roar would be a better option than Solemn and Mirror Force. With Call back, LS players might run an extra Lyla and Breaker might be a popular pick for Monarchs. In that case, Mirror Force is dead and Solemn becomes a burn card for them, while Threatening will stop swarm attacks which will probably be your worst concern in this format. Of course this is just speculation from the banlist, we'll just have to wait and see what happens.