Decaying Marshlands

{t}: Add {c} to your mana pool. If you control a Swamp, you may add {b} to your mana pool instead.
Cycling {1}. Activate this ability only if you control two basic land.
When you Cycle Decaying Waterways, add {b} to your mana pool.
No place, not matter how dark, was safe from the Citadel's wrath.