Feast of Flesh
{B}
Sorcery
~this~ deals X damage to target creature and you gain X life, where X is 1 plus the number of cards named Feast of Flesh in all graveyards.
Swallowing Plague
{X}{B}{B}
Sorcery -- Arcane
~this~ deals X damage to target creature and you gain X life.
Tendrils of Corruption
{3}{B}
Instant
~this~ deals X damage to target creature and you gain X life, where X is the number of Swamps you control.