Took it for a spin on MTGO, modern open-play. Took down an artifact combo deck and a warrior deck. Beat a very aggressive werewolf deck in game 1, but had a weak sideboard against aggro so I ended up losing the match. Macar and Siren were very strong, consistently clearing boards and hands whenever a Lightning Bolt wasn't present.
I've since tweaked sideboard a bit, removing some counters in favor of Fog Banks. Squeezed a couple Ultimate Price in the main board. Will test out again soon!