Dies to Removal

[deck]
Land (22)
3 Ghost Quarter
19 Plains
Creatures (26)
3 Martyr of Sands
4 Serra Ascendant
4 Soul's Attendant
2 Soul Warden
4 Ajani's Pridemate
4 Squadron Hawk
2 Aven Mindcensor
3 Ranger of Eos
I & S (8)
4 Path to Exile
4 Spectral Procession
Enchantment (4)
4 Honor of the Pure
SIDEBOARD
3 Brave the Elements
2 Rest in Peace
2 Stony Silence
2 Sundering Growth
2 Suppression Field
2 Rule of Law
2 Immortal Servitude[/deck]

A very rough guide, using your list:

Vs. R/G Tron
-3 Ranger of Eos
-2 Soul Warden
-2 PTE

+2 Stony Silence
+2 Suppression Field
+3 Brave the Elements

Vs. U/W Tron
-3 Ranger of Eos
-2 Soul Warden

+2 Stony Silence
+2 Rest in Peace
+1 Suppression Field

Vs. UWR
-2 Aven Mindcensor
-1 PTE

+2 Immortal Servitude
+1 Brave the Elements

Don't overboard. You need less answers, more
threats in this matchup.

Vs. Storm
-4 PTE

+2 Rule of Law
+2 Rest in Peace

Vs. Zoo (Gruul, Fast Naya)
-3 Ranger of Eos

+3 Brave the Elements

Frankly, I have no idea. You'd do ok even without boarding anything.

Vs. Zoo (Kibler)

I wouldn't board anything.

You could cut the Mindcensors for Servitudes if you like.

Vs. Jund

-4 Serra Ascendant/Ajani's Pridemate (Former for Jund, latter for white Jund)

+2 BTE
+2 Immortal Servitude

Vs. Burn

-3 Ranger of Eos

+3 BTE

Vs. Affinity

-2 Aven Mindcensor
-2 Ranger of Eos

+2 Stony Silence
+2 Sundering Growth

Vs. Mirror

-2 Aven Mindcensor

+2 BTE

It's pretty blowout to name white with BTE.

There is a lot of combo hate in the sideboard. There are multiple cards that ensure that the opponent will not activate a Birthing Pod, reanimate a creature or sling a storm of spells at me. 3 sisters will also stop a splinter twin-type combo. Also, I have yet to face a control deck at the store that I play at, and Modern tournament season is many months away, so I doubt I'll be playing anywhere besides there. I picked the deck because my local meta is just so full of aggro decks.

That is what I thought too, until I played the deck.

A combo deck that doesn't fight throught sideboard cards is not a good combo deck. Sometimes though they just don't draw their
answer to your answer, and you win.

Key combos of note that give you trouble: Twin, gifts, pod, storm, faith's reward, through the breach, goryo's vengeance, amulet of vigor. Scapeshift and tron shouldn't be too hard.

If your meta is full of aggro, go for it. Modern is a midrange/aggro fest anyway, so sisters are a good deck to pilot.

Don't get me wrong, it's a very powerful deck and I would recommend it to anyone.

I just don't like how little play there is to it and how little you can do about your worst matchups.

It's a relatively simple deck.

Play 8 sisters, 4 spectral processions, 4 honor of the pure, 4 ajanis pride-mate, 4 PTE, 4 Martyrs, 4 Serra Ascendant, 4 Squadron Hawk.

22-24 lands with some number of windbrisk heights, the rest your choice of white weenie (Ranger of Eos is my preferred choice).

You now have a deck that owns any tempo or midrange deck, but get ready to lose to control and combo decks (Thalia helps immensely). Oh, and infect.