Here's my Martell Brotherhood deck with which I participated at this year's Stahleck joust tournament (Thanks to Jekothalep for some help with the deck). The deck was constructed 3 days before Stahleck, hence I could not test the deck (which was not really necessary).

The goal of the deck is simple: get the Red Viper and Beric on the table (and some Taste for Blood) At the end I made the 35th place. I had no major problems with the deck, but I made some rather bad decisions in some games...

Martell Housecard
The Brotherhood Without Banners

Plots:
Fury of the Sun
Valar Morghulis
A Song of Summer
Power of Blood
Attack From the Sea
Fear of Winter
Let my Porridge Fly

Characters: 26
3 x Orphan of the Greenblood
3 x Refugee of the Citadel
2 x Herald of the Sun
3 x Flea Bottom Scavenger
2 x Maester of Lemonwood
1 x Tom Sevenstrings
1 x Thoros of Myr
1 x Arianne Martell
1 x Ellaria Sand
1 x Ser Arys Oakheart
1 x Varys
2 x Edric Dayne
3 x Beric Dondarrion
2 x The Red Viper

Locations: 12
1 x Lord Doran's Chambers
3 x Summer Sea
3 x Water Garden
2 x Palace Fountains
1 x Shadowblack Lane
2 x Lost Oasis

Attachments: 10
3 x Venomous Blade
3 x Taste For Blood
2 x Bodyguard
2 x Milk of the Poppy

Events: 12
2 x Condemned by the Council
2 x Ill Tidings
2 x A Game of Cyvasse
3 x He Calls It Thinking
3 x Burning on the Sand