Crypt Ghast

Extort (Whenever you cast a spell, you may pay {(}w/b)}. If you do, each opponent loses 1 life and you gain that much life.)\r
Whenever you tap a Swamp for mana, add {B} to your mana pool (in addition to the mana the land produces).

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever you tap a Swamp for mana, add an additional {B}.

Many noticed the dark energy emanating from the crypt. None could fathom the twisted spirit controlling it.

Secret Lair Drop

The soul of a murderer from the old world, steeped for centuries in rot and malevolence.

Duskmourn: House of Horror Commander

Extort
Whenever you tap a Swamp for mana, add an additional {B}.

Ravnica Remastered

Extort (Whenever you cast a spell, you may pay {(}w/b)}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever you tap a Swamp for mana, add an additional {B}.