Realkavuka, Red Mana God

When Realkavuka Enters the battlefield, Enemy loses 3 life.
{r} Enemy puts a card into their graveyard.
Stacks.
{r}{r} Enemy loses 4 Life and discards a tapped creature card that's in play. They lose 5 life if they discard a non {r} card.
{r}{r}{r} Enemy loses their creature cards.