Squeaker!
(Including the Rat King and Queen)

Land (19):

14 Swamp
1 Lake of the Dead
4 Quicksand

Creatures (22):

4 Bog Rats
4 Rabid Rats
4 Pestilence Rats
4 Razortooth Rats
2 Diseased Vermin
1 Crypt Rats
1 Rat of Rath
1 Rag Man
1 Sorceress Queen

Sorcery [and others] (19):

4 Dark Ritual
4 UnHoly Strength
4 Terrors
2 Pox
2 Lab Rats
1 Fevered Convulsions
1 Greed
1 Bone Harvest