Love this deck. I would add Serra Avatar and Devout Lightcaster

I know this is an old post but have you thought about putting Venser's Journal in this deck?

Altonane

If you have a large hand by the time you have 5 mana out on the field, you aren't playing Soul Sisters correctly.

If you have 5 mana on the field and cards in your hand, you should be able to play at least 2 monsters because of the low overall mana costs of the monsters.

If you have 5 mana on the field and just Venser's in your hand, then Venser's is useless.

why do you maindeck 4 Flagstones of Trokair when you are not running Armageddon?

I need help. Ive seen lately this deck working and gathered a lot of info on it, but still do you recommend buildig this deck on paper for a newcomer to the modern format such as me?I get it that it is good in the current meta, but is that just it or will the deck still be viable in a near future? Do I only maintain the path to exile which is a staple.

Have you considered maindeck Ghost Quarter? I know that it doesn't make white mana, but Tron is a major player in modern, and many decks will only be able to handle 1 or 2 before it starts acting like strip mine.

I'm running what you're running except I replaced the Squadron Hawk with a Archangel of Thune, an Ajani, Caller of the Pride, and 2 Brave the Elements

I agree with the Archangel of Thune comments. It is basically an auto-win unless they counter it or you have no other creatures. Also, Windbrisk Heights has great synergy with it.

Sorry is someone else has already said this, but have you considered Felidar Sovereign or Divinity of Pride?

I don't really see the point in putting a squadron hawk. Instead you could play Auriok Champion. it helps with the current meta with Abzan Collected company, Burn, Delver. Just my personal opinion 3 Auriok Champion and a 1 of Archangel of Thune.

I like the way it runs but instead of the flagstone of trokair how about 4 emeria, the sky ruin. I say this because you can get back your guys that died and keep sacrificing martyr of sands to gain a lot of life.

Soul warden is my favorite card too! I Started playing magic when i was 10, and had this pathetic unsleeved white weine deck that was just an awful stack of random cards i liked. I never won and my brothers laughed at it because i had no thought process for how i played. Ahh memories.

i'd sideboard some Sanctimony.

It's pricy, and situationally worse than Soul Sisters, but consider Auriok Champion. Big counter to mirrors, burn, removal, and uhm, anything.

Maybe sideboard grand abolisher to stony silence?

Have you thought about running the Elspeth from theros for more creatures entering a turn

Auriok Champion would be my only suggestion.

Excellent deck.

Why arent you running auriok Champion?

Soul sisters is not tier 1.5

It has been on and off through out the years dude. His description is out of date is all.