Infect
A Modern deck, by sacakewalk
4th place at a tournament in Magic Online on 2013-01-06
As reported at http://www.wizards.com/Magic/Digital/MagicOnlineTourn.aspx?x=mtg/digital/magiconline/tourn/4776139

Maindeck:

Creatures
4 Blighted Agent
4 Glistener Elf
4 Noble Hierarch
4 Plague Stinger

Enchantments
2 Rancor

Instants
4 Apostle's Blessing
4 Groundswell
4 Might of Old Krosa
4 Mutagenic Growth
4 Vines of Vastwood

Sorceries
2 Thoughtseize

Basic Lands
2 Forest

Lands
2 Breeding Pool
4 Inkmoth Nexus
4 Misty Rainforest
2 Overgrown Tomb
4 Verdant Catacombs

Legendary Lands
2 Pendelhaven (Not currently legal in Modern)

Sideboard:
4 Spellskite
3 Abrupt Decay
1 Darkblast
2 Dismember
1 Hurkyl's Recall
2 Nature's Claim
2 Thoughtseize