Mourning Ritual

When Mourning Ritual enters the battlefield,
sacrifice it unless a creature you control died this
turn.
At the beginning of your upkeep, put a ritual
counter on Mourning Ritual.
When the fourth ritual counter is placed on
Mourning Ritual, draw 2 cards. Sacrifice
Mourning Ritual.
{b}{b}: Put a ritual counter on Mourning Ritual.