Incarnation of Evil

{b}, {t}: Target player sacrifices a creature.
{u}, {t}: Target player puts the top 4 cards of their library into their graveyard.
{r}, {t}: Incarnation of Evil deals 4 damage to any target.
{g}, {t}: Put a +1/+1 counter on one target creature, then put a -1/-1 counter on another target creature.
Whenever a creature enters the graveyard from anywhere, untap Incarnation of Evil.