U/R Twin
A Modern deck, by Peter Dun
6th place at a tournament in Lyon, France on 2012-11-04
As reported at http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtg/daily/eventcoverage/gplyo12/welcome#1

Maindeck:

Creatures
4 Deceiver Exarch
4 Grim Lavamancer
4 Pestermite

Enchantments
4 Splinter Twin (Banned in Modern)

Instants
3 Dispel
3 Spell Pierce

Legendary Creatures
2 Kiki-Jiki, Mirror Breaker

Sorceries
3 Inquisition of Kozilek
4 Serum Visions
4 Sleight of Hand

Basic Lands
3 Island
1 Mountain

Lands
1 Arid Mesa
2 Cascade Bluffs
3 Halimar Depths
4 Misty Rainforest
4 Scalding Tarn
3 Steam Vents
1 Stomping Ground
2 Sulfur Falls
1 Watery Grave

Sideboard:
3 Spellskite
3 Blood Moon
3 Ancient Grudge
2 Cyclonic Rift
1 Dispel
1 Mizzium Skin
2 Duress