Most stores have 80 prerelease boxes. It used to be 16 for each guild split by 5. Now we split by 10, so there are going to be 8 boxes per store. Of course, I'm pretty sure the number is 80, but I could be wildly off. Who knows...

We also know that there are secret guilds with the guild we choose. It is one of the four guilds from the opposite set that shares one of the colors of your guild's color pair (ex. Izzet can be paired with Dimir, Boros, Gruul, or Simic).

So... I've worked out what probability each guild will have at a particular shared color. Let me explain a bit...

Given the Izzet example, I did this for all the guilds. And I came up with this:

Guild | Color 1 | Color 2 | Color 3 |

Azorius (White/Blue) | 50% - Black | 25% - Green | 25% - Red |

Orzhov (White/Black) | 50% - Green | 25% - Blue | 25% - Red |

Dimir (Blue/Black) | 50% - Red | 25% - White | 25% - Green |

Izzet (Blue/Red) | 50% - Green | 25% - Black | 25% - White |

Rakdos (Black/Red) | 50% - White | 25% - Green | 25% - Blue |

Golgari (Black/Green) | 50% - Blue | 25% - Red | 25% - White |

Gruul (Red/ Green) | 50% - Black | 25% - White | 25% - Blue |

Boros (Red/White) | 50% - Blue | 25% - Black | 25% - Green |

Selesnya (Green/White) | 50% - Red | 25% - Blue | 25% - Black |

Simic (Green/Blue) | 50% - White | 25% - Red | 25% - Black |

So, essentially, this tell you what guild to choose for a tri-color pair. Or at least the best chance of getting the pair you want (which is 50%).

So, if you want the Esper Shard you should choose Azorius, Dimir for Grixis, Gruul for Jund, Selesnya for Naya, and Simic for Bant.

Don't know the shards? Quick explanation:

Don't know the shards? Quick explanation:

- Esper = W/U/B
- Grixis = U/B/R
- Jund = B/R/G
- Naya = R/G/W
- Bant = G/W/U

If you want enemy wedges, choose the following: Orzhov for Necra, Izzet for Ceta, Rakdos for Dega, Golgari for Ana, and Boros for Raka.

Don't know what those are? Tristamicus commented about them on this post. But here is a quick breakdown:

- Ana = U/B/G or BUG
- Ceta = U/R/G or RUG
- Dega = W/B/R or Kaalia of the Vast's colors
- Necra = W/B/G or "Junk"
- Raka = W/U/R or "America"

But there's more! Just like with the extra colors, of course you could get different shards or wedges. We're just talking high probability here...

I took the math just a little further... I decided to see which guilds had more allied and more enemy color pairs.

Guild | Color 1 | Color 2 | Color 3 |

Azorius (White/Blue) | 50% - Esper | 25% - Raka | 25% - Bant |

Orzhov (White/Black) | 50% - Necra | 25% - Esper | 25% - Dega |

Dimir (Blue/Black) | 50% - Gixis | 25% - Ana | 25% - Esper |

Izzet (Blue/Red) | 50% - Ceta | 25% - Grixis | 25% - Raka |

Rakdos (Black/Red) | 50% - Dega | 25% - Jund | 25% - Grixis |

Golgari (Black/Green) | 50% - Ana | 25% - Necra | 25% - Jund |

Gruul (Red/ Green) | 50% - Jund | 25% - Naya | 25% - Ceta |

Boros (Red/White) | 50% - Raka | 25% - Dega | 25% - Naya |

Selesnya (Green/White) | 50% - Naya | 25% - Bant | 25% - Necra |

Simic (Green/Blue) | 50% - Bant | 25% - Ceta | 25% - Ana |

I took the math just a little further... I decided to see which guilds had more allied and more enemy color pairs.

Guild | % Allied | % Enemy |

Azorius | ||

Orzhov | ||

Dimir | ||

Izzet | ||

Rakdos | ||

Golgari | ||

Gruul | ||

Boros | ||

Selesnya | ||

Simic |

Of course, it shouldn't be a surprise that the allied color guilds have more of the shards and the enemy color guilds have more of the wedges, but... Wait, Rakdos and Simic? What is their problem?

I went back and did this twice, and I also had someone look over my work... Rakdos and Simic both have an equal chance of being an allied pair or an enemy pair with your secret guild.

Anyway, long story short, if you want to know which guild to choose for the higher chance you'll get the color pairing you want, take the math from the first table. But remember this:

If a store has 80 boxes, and each guild has 8 boxes in all, in a statistically perfect situation, 4 will have the color pairing you want, and 4 won't, but hopefully of the 4 that won't, 2 of them will have a pair you're okay with. So for instance, if you want Grixis, go with Dimir, but if you know you want an allied shard if you can't have Grixis, Dimir is probably your best bet (since 50% will be Grixis and 25% will be Esper).

I'd like to use Boros and Simic, but Selesnya might be better in place of Boros since I'd like Naya, and for Simic, since I want RUG/Ceta, I'd be better off with Izzet since I have a better chance.

Anyway, I hope you like my assessment. Good luck in you're prerelease, and enjoy playing with Dragon's Maze!