At the beginning of your upkeep, tap Carnophage unless you pay 1 life.

Carrion Feeder can't block. Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

Cycling {B}{B} ({B}{B}, Discard this card: Draw a card.) When you cycle Gempalm Polluter, you may have target player lose life equal to the number of Zombies on the battlefield.

When Grave Defiler enters the battlefield, reveal the top four cards of your library. Put all Zombie cards revealed this way into your hand and the rest on the bottom of your library in any order. {1}{B}: Regenerate Grave Defiler.

Other Zombie creatures get +1/+1. {1}{B}, {T}: Return target Zombie card from your graveyard to your hand.

{T}: Each player loses 1 life for each Zombie on the battlefield.

At the beginning of your upkeep, sacrifice Contamination unless you sacrifice a creature. If a land is tapped for mana, it produces {B} instead of any other type and amount.

{2}, {T}: Add {B} for each Swamp you control.

{T}: Add {C}. {T}, Sacrifice Crystal Vein: Add {C}{C}.

({T}: Add {B}.)

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.