Cabal Pit

{T}: Add {B}. This land deals 1 damage to you.
Threshold — {B}, {T}, Sacrifice this land: Target creature gets -2/-2 until end of turn. Activate only if seven or more cards are in your graveyard.

The List

Odyssey

oc
T: Add o
B to your mana pool. Cabal Pit deals 1 damage to you.
Threshold o
B, oc
T, Sacrifice Cabal Pit: Target creature gets -2/-2 until end of turn. (Play this ability only if seven or more cards are in your graveyard.)