The reason I said Heights is slow because it comes to the table tapped and adds no benefit in the deck. We are a control deck that don't mind slow plays, but having slow lands with no upsides on our list isn't optimal. Inspector is 1 drop that gives blocker, card draw and is white so enables martyr. It is a very solid card.
This is not a soul sisters deck and behaves really differently. Adding Soul Warden or Soul's Attendant is a big mistake as they rely on quick and aggressive play style which does not go well with rest of this deck. Are you building martyr proc out of soul sisters deck? If so, you have to learn new play style as we generally don't win quick like SS tries to with their anthem effects and weenies on board.
Burial is solid, but Felidar Sovereign is iffy. Expensive and doesn't do anything when it enters the battlefield. It could work but I'd say titan or Archangel Avacyn is better high cmc creature for the list.
I fail to see merit in Windbrisk Heights. It is slow and rest of the deck lacks synergies with it. Also 26 lands seems bit excessive. Chalice of life is a nice touch, but I would rather have one Aetherflux Reservoir. Drop 2 Heights and you could throw in Thraben Inspector or more O-rings.
I'll bet it be sideboard card at most, though it could prove to be useful if meta is in its favor.
Leonin Warleader seems like a good option. Spawning tokens with lifelink is great if you get Leonin Warleader on T4 and Archangel of Thune on T5. On the other hand archangel wina you the match anyway.
The reason I said Heights is slow because it comes to the table tapped and adds no benefit in the deck. We are a control deck that don't mind slow plays, but having slow lands with no upsides on our list isn't optimal. Inspector is 1 drop that gives blocker, card draw and is white so enables martyr. It is a very solid card.
This is not a soul sisters deck and behaves really differently. Adding Soul Warden or Soul's Attendant is a big mistake as they rely on quick and aggressive play style which does not go well with rest of this deck. Are you building martyr proc out of soul sisters deck? If so, you have to learn new play style as we generally don't win quick like SS tries to with their anthem effects and weenies on board.
Burial is solid, but Felidar Sovereign is iffy. Expensive and doesn't do anything when it enters the battlefield. It could work but I'd say titan or Archangel Avacyn is better high cmc creature for the list.
Leonin Warleader seems like a good option. Spawning tokens with lifelink is great if you get Leonin Warleader on T4 and Archangel of Thune on T5. On the other hand archangel wina you the match anyway.