Ok. A lot of people have a problem with this deck, and I understand why. When you go into a tournament and you play against someone doing "soul sisters," you're usually playing a modern newbie who netdecked a thing that looked really cheap. Out of this, you get a really weak deck that isn't hard to beat, but it takes an Assload of time. It's unfortunate, because I think soul sisters has some serious potential as a competitive deck, and here's my case for a "real" sisters deck. I've put a lot of time and effort into this, as sisters have been one of my favorite decks for almost 2 years now, and I've spent the better part of the last 3 weeks mulling over how to make this an actual threat in modern.
The sisters
So, the sisters. These are the backbone of the deck, and do a lot of the mid and late game life gain.
Soul Warden - My oldest good deck ran 4 of her, and I cried when I decided to drop to 3 to make room for the 3rd sister.
Soul's Attendant - Same as warden, but without my emotional attatchment.
Auriok Champion - A sister with some power! The pro red and pro black makes her already harder to kill and she's fast enough in mono white to be powerful.
The Creatures
These are the guys that you are gaining craploads of life off of from your sisters.
Ajani's Pridemate - This guy has the added bonus of getting HUGE in this deck. Like, hilariously huge. I've easily gotten him to an 80/80 in multiplayer games.
Martyr of Sands - This is the reason that the deck has another name "martyr proc." She's beautiful. Take her in your opening hand if you have at least two mana and you have the optimal opening move. Plains -> Martyr; Plains -> Martyr Proc, reveal 4-5 white cards, drop Serra Ascendant for a 6/6 flying lifelink on turn 2. It happens more than you'd think.
Ranger of Eos - More often than not this guy is searching for your Ascendants. If you absolutely need some sisters, he can fetch them too though.
Serra Ascendant - This is the powerhouse of the deck. Getting flying, lifelink, and being a 6/6 as early as T2 for one mana is an almost unstoppable force, especially if you stick some sword on him or give him indestructible for a turn with spirit bonds.
Squadron Hawk - This guy fills your hand. Play one and you instantly get 3 more creatures to play for the extra life, or even the extra little bit of flying damage that is oh-so-important when they block your ascendant. Also, there's a reason caw-blade was almost unstoppable in standard. Give a hawk a sword and shit gets real.
Enchantments
This guys do the work in this deck. This is where most of the sideboarding comes in, because these are situational for the decks you're playing against.
Honor of the Pure - Basically, make sure your sisters dont get gut checked. Pyroclasm is your worst enemy, and honor of the pure is great at defending against that (well, if you have both. If not, better start swinging with the sword. You might end up getting MORE life in the long run if they board wipe and let you play your stuff again.)
Spirit Bonds - This was a card that I looked at when M15 came out and my jaw actually dropped when I saw how cheap it was. It's like a Knight-Captain of Eos for spirits, for waaaaaay cheaper, and continually spawns extra fliers! It doesn't really matter if they kill your hawks, as long as you have something to equip the sword to you're doing a LOT of damage and gaining all teh advantages. This card was MADE for soul sisters I feel like.
The Artifact
Well, it does what it needs to. It provides a pretty much immediate threat when it hits the board and can win me the game if not dealt with.
Sword of Light and Shadow - Stick this in a hawk or spirit and give people flashbacks to the days of cawblade beatdowns.
Spells
These aren't very interesting.
Condemn - stick that baddie that's swinging with deathtouch on the bottom of their library. Plain and simple.
Path to Exile - If you're playing white and not using this card as control you're doing it wrong. It is how you stop people's decks.
Lands
Plains - duh
Flagstones of Trokair - This guy is a card advantage land, almost. He's a strict upgrade over plains, because of the anti land destroy ability, but you can also tap one, play another to sac the first and pull a plains out of your deck to increase draw chances later in the game without falling behind the curve.
Windbrisk Heights - This is a fun way to get a sword or a ranger of eos out, you get to cast it for 2 mana if you attacked with 3+ creatures this turn. Swing with some weenie spirits, hawks, or your ascendants and pull a sword out for the lulz.
Ghost Quarter - You need it in control matchups. You just do. Their man lands will eventually beat you down if you don't have these.
The sideboard
Things aren't super complex with the sideboard. It's pretty standard for combo, aggro, and jund hate.
Supression Field - No Mas combo
Dismember - Need more spot removal? You have the life for it.
Ghostly Prison - hahaha you thought your pestermites were going to kill me, didn't you.
Leyline of Sanctity - No thoughtsieze for you!
Rest in Piece - This one hurts a little bit, but it's going to hurt dredge and show and tell a hellufalot more than it's going to hurt you.
Stony Silence - Lol affinity thought it was going to do things
Sundering Growth - Anti artifact/enchant, pretty basic. Can also populate spirits.
