U/R Twin
A Standard deck, by Lucas Mercader
4th place at a tournament in Alcoy, Spain on 2011-08-14
As reported at http://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/eventcoverage/spnat11/welcome#0

Maindeck:
8 Island
5 Mountain

Artifacts
3 Shrine of Piercing Vision (Not currently legal in Standard)

Creatures
4 Deceiver Exarch (Not currently legal in Standard)

Enchantments
4 Splinter Twin (Not currently legal in Standard)

Instants
4 Dispel (Not currently legal in Standard)
4 Into the Roil
3 Mana Leak (Not currently legal in Standard)
1 Twisted Image (Not currently legal in Standard)

Sorceries
4 Gitaxian Probe (Not currently legal in Standard)
4 Ponder (Not currently legal in Standard)
4 Preordain (Not currently legal in Standard)
2 See Beyond (Not currently legal in Standard)

Lands
1 Arid Mesa (Not currently legal in Standard)
2 Halimar Depths (Not currently legal in Standard)
3 Misty Rainforest (Not currently legal in Standard)
4 Scalding Tarn (Not currently legal in Standard)

Sideboard:
2 Azure Mage (Not currently legal in Standard)
2 Combust (Not currently legal in Standard)
1 Mana Leak (Not currently legal in Standard)
3 Mental Misstep (Not currently legal in Standard)
2 Mutagenic Growth (Not currently legal in Standard)
1 Shatter (Not currently legal in Standard)
4 Pyroclasm (Not currently legal in Standard)