Cultist of the Twisted Dark

When Cultist of the Twisted Dark enters the battlefield, create X 2/2 black zombie tokens.
Whenever a creature you control dies, you may pay {3}{c}. If you do, create a 4/2 colorless eldrazi servant token.
{2}{c}: sacrifice Cultist of the Twisted Dark. Create a 4/2 colorless eldrazi servant token.