Grixis Twin
A Modern deck, by Andrew Tenjum
11th place at a tournament in Las Vegas, Nevada, United States on 2015-12-11

Maindeck:

Creatures
4 Deceiver Exarch
2 Pestermite
4 Snapcaster Mage

Enchantments
4 Splinter Twin (Banned in Modern)

Instants
1 Cryptic Command
2 Dispel
2 Kolaghan's Command
4 Lightning Bolt
1 Murderous Cut
4 Remand
2 Spell Snare
1 Terminate

Legendary Creatures
2 Vendilion Clique

Sorceries
4 Serum Visions

Basic Lands
4 Island
1 Mountain
1 Swamp

Lands
1 Blood Crypt
1 Bloodstained Mire
1 Desolate Lighthouse
4 Polluted Delta
4 Scalding Tarn
2 Steam Vents
3 Sulfur Falls
1 Watery Grave

Sideboard:
2 Blood Moon
1 Kolaghan's Command
2 Negate
1 Terminate
1 Olivia Voldaren
1 Pia and Kiran Nalaar
2 Keranos, God of Storms
2 Anger of the Gods
1 Shatterstorm
2 Thoughtseize