Quag Sickness

Enchantment — Aura    (CMC:3)

Enchant creature Enchanted creature gets -1/-1 for each Swamp you control.

The dread gases didn't kill Farbid. But as he lay in the muck, miserable and helpless, watching ghouls and rats advance on him, he wished they had.

110 M14 • ENMartina Pilcerova

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Legal in: Modern,Extended,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Tribal Wars Standard,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Quag Sickness {2}{B} Enchantment — Aura Enchant creature Enchanted creature gets -1/-1 for each Swamp you control.

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8/15/2010
This ability counts the number of Swamps controlled by Quag Sickness's controller, not the enchanted creature's controller (in case they're different players).
8/15/2010
This bonus is not fixed; it changes as the number of Swamps you control changes.
8/15/2010
The ability cares about lands with the land type Swamp, not necessarily lands named Swamp.

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