Thopter Depths
An Extended deck, by Todd Anderson
4th 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/top8decklists

Maindeck:

Artifacts
4 Chrome Mox (Not currently legal in Extended)
1 Engineered Explosives (Not currently legal in Extended)
2 Sword of the Meek (Not currently legal in Extended)
3 Thopter Foundry (Not currently legal in Extended)

Creatures
4 Dark Confidant (Not currently legal in Extended)
4 Vampire Hexmage

Instants
4 Muddle the Mixture (Not currently legal in Extended)
2 Repeal (Not currently legal in Extended)
3 Smother
3 Thirst for Knowledge (Not currently legal in Extended)

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

Sorceries
1 Compulsive Research (Not currently legal in Extended)
4 Thoughtseize (Not currently legal in Extended)

Basic Lands
3 Island
1 Swamp

Lands
4 River of Tears (Not currently legal in Extended)
4 Sunken Ruins (Not currently legal in Extended)
3 Tolaria West (Not currently legal in Extended)

Legendary Lands
1 Academy Ruins (Not currently legal in Extended)
4 Urborg, Tomb of Yawgmoth

Legendary Snow Lands
4 Dark Depths (Not currently legal in Extended)

Sideboard:
1 Chalice of the Void (Not currently legal in Extended)
1 Gatekeeper of Malakir
3 Extirpate (Not currently legal in Extended)
2 Jace, the Mind Sculptor (Banned in Extended)
2 Damnation (Not currently legal in Extended)
4 Deathmark
2 Duress