Spoiled by Captain Black on MTGSalvation, we now have the nearly complete Duel deck (withholding only the Scars of Mirrodin card). See the spoiled Elspeth, Knight-Errant deck. It was officially released by Wizards on Aug. 26, 2010 as part of their Arcana.

[cardlist]

[Lands]

1 Darksteel Citadel

20 Island

1 Mishra's Factory

1 Seat of the Synod

1 Stalking Stones

[/Lands]

[Creatures]

1 Arcbound Worker

1 Assembly-Worker

1 Clockwork Condor

1 Clockwork Hydra

1 Esperzoa

1 Faerie Mechanist

1 Frogmite

1 Juggernaut

1 Master of Etherium

1 Pentavus

1 Qumulox

1 Razormane Masticore

2 Runed Servitor

1 Serrated Biskelion

1 Silver Myr

1 Steel Overseer

1 Steel Wall

1 Synod Centurion

1 Trinket Mage

1 Triskelion

[/Creatures]

[Spells]

1 Æther Spellbomb

1 Argivian Restoration

1 Contagion Clasp

1 Echoing Truth

1 Elixir of Immortality

1 Energy Chamber

2 Everflowing Chalice

1 Foil

1 Moonglove Extract

2 Thirst for Knowledge

1 Thoughtcast

1 Trip Noose

[/Spells]

[Planeswalker]

1 Tezzeret the Seeker

[/Planeswalker]

[/cardlist]