Swallower of Anger

Suspend 6 — {1}{b}{r}
Whenever a creature dies, if Swallower of Anger is suspended, exile that creature and remove a time counter from Swallower of Anger.
When Swallower of Anger enters the battlefield, return each creature card exiled with it to the battlefield under your control. Those creatures gain haste. Sacrifice those creatures at the
beginning of your next end step.