22 Swamp
4 Dark Ritual
4 Drainpipe Vermin
4 Duress
4 Hymn to Tourach
4 Ostracize
4 Pack Rat
4 Persecute
4 Ravenous Rats
4 Swarm of Rats
4 Tragic Slip
Sideboard:
4 Deathmark
4 Engineered Plague
4 Nature's Ruin
4 Perish