@CwaM I tried. Honestly not for long because I did not like it from game 1 and I'm not really sure if I want to give it a second chance, but maybe it is just me having a problem with Vryn Wingmare. I was always taking one or the other out when boarding. I usually just put the Wingmares in my sideboard and kept Thalias. In rare occasions I kept both and cut Smashers. (I played 3/3/3 of those). When I was taking out Thalia, Heretic Cathar I usually put in Spirit of the Labyrinth. Thalia usually dies on first occasion while Wingmare stays in play. But I don't usually manage to kill someone with Wingmares, they need help from the Eldrazi creatures.
(I was just trying to figure out which creatures work best for me so my sideboard wasn't really a sideboard but rather cards I considered playing main deck. On the other hand I came to conclusion that I'd rather play 4 Null Rod. )