Grixis Control
An Extended deck, by Patrick Chapin
10th place at a tournament in Houston, Texas, United States on 2010-04-04
As reported at http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/eventcoverage/gphou10/day2decklists

Maindeck:

Artifacts
3 Chrome Mox (Not currently legal in Extended)
4 Dimir Signet (Not currently legal in Extended)

Creatures
3 Gatekeeper of Malakir
3 Mulldrifter (Not currently legal in Extended)

Instants
2 Countersquall (Not currently legal in Extended)
3 Cryptic Command (Not currently legal in Extended)
1 Flashfreeze
2 Repeal (Not currently legal in Extended)
3 Smother
3 Thirst for Knowledge (Not currently legal in Extended)

Legendary Enchantments
2 Night of Souls' Betrayal (Not currently legal in Extended)

Legendary Planeswalkers
3 Jace, the Mind Sculptor (Banned in Extended)

Sorceries
3 Cruel Ultimatum (Not currently legal in Extended)
3 Damnation (Not currently legal in Extended)

Basic Lands
2 Island
1 Swamp

Lands
2 Blood Crypt
1 Cascade Bluffs (Not currently legal in Extended)
1 Dreadship Reef (Not currently legal in Extended)
1 Graven Cairns (Not currently legal in Extended)
1 Lavaclaw Reaches
2 River of Tears (Not currently legal in Extended)
4 Scalding Tarn
1 Steam Vents
4 Sunken Ruins (Not currently legal in Extended)
2 Watery Grave

Sideboard:
1 Countersquall (Not currently legal in Extended)
1 Cryptic Command (Not currently legal in Extended)
3 Flashfreeze
1 Night of Souls' Betrayal (Not currently legal in Extended)
2 Cranial Extraction (Not currently legal in Extended)
1 Damnation (Not currently legal in Extended)
2 Deathmark
1 Sadistic Sacrament
3 Thoughtseize (Not currently legal in Extended)