I think some number of Thalia in the side is mandatory for combo matchups.Taking this to FNM tomorrow; anyone have advice on sideboarding? What are the cards that you never side out? With a deck with a very tight plan such as this one, it is sometimes difficult to see which cards will be the least important in a match. I usually take out the Martyrs against midrange and Ranger, sisters (max 2), Path, or Procession against various forms of combo, depending on the type and how many cards I want to bring in, but none of the substitutions ever feel as "clean" as the ones I make when playing a type of red aggro.
Brave the Elements could be good too. Also, Spirit Loop seems to go well with Ajani's Pridemate. Maybe even Gift of
Orzhova if you're feeling lucky.
Chalice of Life is pretty cool as well. Don't know if it's worth the slots or not.