Seeker of souls

Whenever a creature dies create two 1/1 eldrazi scions. This creature has "sacrifice this creature add {c} to your mana pool.
{p/c}{p/c} or {4} This creature gets +{x+{x} for all creatures that have died this turn, or you gain one life for each creature that died this turn.
Deathtouch, haste, swampwalk