You might want to consider Emeria, The Sky Ruin in place of a Flagstones of Trokair and also Brave the Elements is really good as it can help you get by blockers or protect your guys from a board wipe/bolt.

This is my deck:
http://tappedout.net/mtg-decks/serra-sisters/

I'll toss Brave the Elements into the sideboard, it's in nearly all my Mono-White builds.

I do have to wonder about Emeria, The Sky Ruin, how often do you actually reach the required seven Plains? I hardly even reach that many lands with my other decks. I might consider running it has a one-of.

I like this one! It feels only a little bit unpolished. While Archangel of Thune has an amazing effect inside tis kind of deck, I do not really know, if the mana costs might not be a bit steep. You may be better served with playing only 20 lands and only four drops as your maximum. Ranger of Eos is just awesome!

On the other side, it would lose the personal touck I like about your decks :D

Thanks a ton! I'm still working out the kinks but I really like where this is going.

Yeah, I've considered that Archangel of Thune might be a bit mana hungry, I'm going to run with her though. I already own Archangel of Thune so there's no problem just testing it.

If it negatively affect the deck I'll probably switch them out with Angel of Jubilation or maybe even another Hero of Bladehold and Martyr of Sands.

I'm trying to put my stamp on Soul Sisters, try and make it my own. We'll see how it goes! :D

LordDerrien, moved some stuff around trying to clean this up a bit!

What an awesome short Story! The quotation of Martyr of Sands gave me shivers.

The Addition of a Efficient Card like Spectral Procession is also a Great boon to the deck.

Thanks! I like to give my decks a little bit of lore, very funny to build a mythology behind the deck!

Very effective card, I can't figure out if I want to cut a few cards to fit in some more Secure the Wastes and Spectral Processions or just keep it as is.

I would keep it as it is. Just playtest it and look out for adding maybe the fourth Martyr of Sands or change the split between Spectral Procession and Secure the Wastes.

I'll be doing some testing, considered a fourth Martyr of Sands, we'll see how it goes!

Beautifully written

What do you think of Hallowed Moonlight in the sideboard? Beats collected company, twin, and anything else that likes to cheat out creature, and Rest in Peace beats any deck that uses the graveyard, it makes delver suddenly play 6 mana spells. Also I would suggest Disenchant over Sundering Growth You don't get the populate, bot you're not screwed if you only have 1 white source.

I like Hallowed Moonlight in most Sideboards but this deck is actually pretty strong against Comapany and Twin. More Creatures = More Life.

Disenchant is good, thanks for showing me, I might miss the Populate but it's better over all

Love Rest in Peace. I'd like to find a place for it but I actually cut it from the Side for the two Wrath of Gods.

Do you really need the additional four Celestial Flares?And as for Rest in Peace belive me, you would want that as your graveyard hate!Disenchant is also the more competitve option. It does not screw you if your mana is not perfect.

And on another note. Yes you might gain life through twin and colected company, but at lest company will bring out creatures that fuck you up royally. A one or two of Hallowed Moonlight might just be a good idea.

Oh another good card is Emeria, The Sky Ruin I know it takes a little bit to get up and running, but soul sisters is a deck that can last.

I'll find a place for Rest in Peace, it shuts down a lot of strategies... ironically it shuts down Martyr Proc. xD

Four Celestial Flares are there because there's a guy at the LGS running amok with U/G Infect. I'll NEVER be able to win a tournament unless I have a gross amount of removal.

Selcath, mmm Emeria, The Sky Ruin is something I've been mulling over. I might include one.

I just a fair few colorless mana and lands and enter tapped.

Yup meta call beats everything :)

True, you would not be able to return your Martyr with Rest in Peace in play. But on the other hand dredge and reanmitor do not eat you alive :D

Emeria, The Sky Ruin looks good, but it needs seven plains to trigger, that might be difficult, and on another note. A hand wit two lands, one emeria the other windbrisk heights is just feel bad with that many one drops...

I don't really ever bring back creatures from the graveyard unless I Side in Return to the Ranks, I just find it funny that Rest in Peace shuts down Martyr Proc, a variation of Soul Sisters :D

I might cut Brave the Elements for Rest in Peace, Auriok Champion is already a pretty good defense against Red decks and sweepers.

True... Emeria, The Sky Ruin probably doesn't work that well in Modern... maybe Commander!

I've thought about throwing Felidar Sovereign into the Side for Mirror Matches, I hear the Soul Sister Mirror is just Hell.

Soul Sisters mirror is Hell. Especially if you're both running Ghostly Prison

Oh GOSH.

Probably going to Mill yourselves before anyone wins :D

+1 FOR MORE EPIC DESCRIPTIONS!!!

Thanks Maringam! :D

Speaking of Ghostly Prison I would recommend it. It's a really good sideboard card, and Twin usually scoops to it game 1 if it resolves.

I will keep that in mind.

I'm new to the competive scence, could someone please tell me that kind of match-ups I might see and which match-ups are good and bad.