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U/R Twin
A Modern deck, by Seth Manfield
2nd place at a tournament in Baltimore, Maryland, United States on 2015-02-28

Maindeck:

Creatures
4 Deceiver Exarch
2 Grim Lavamancer
2 Pestermite
4 Snapcaster Mage

Enchantments
4 Splinter Twin (Banned in Modern)

Instants
2 Cryptic Command
1 Dispel
2 Electrolyze
4 Lightning Bolt
4 Remand
1 Spell Snare
1 Thought Scour

Legendary Creatures
1 Vendilion Clique

Sorceries
1 Flame Slash
4 Serum Visions

Basic Lands
5 Island
1 Mountain

Lands
1 Desolate Lighthouse
4 Misty Rainforest
4 Scalding Tarn
3 Steam Vents
1 Stomping Ground
3 Sulfur Falls
1 Tectonic Edge

Sideboard:
1 Batterskull
2 Engineered Explosives
1 Spellskite
2 Sower of Temptation
2 Blood Moon
3 Ancient Grudge
1 Dispel
1 Negate
1 Keranos, God of Storms
1 Jace, Architect of Thought