Xegolen, Nightmare Bogs

When Xegolen enters the battlefield, each opponent loses 3 life, for each life each opponent lost, they discard the top card of their deck.
{1}{u}{b}{g}{t}: Each creature on the battlefield gets
-1/-1. For each -1/-1 counter on the battlefield,
you may split between life and +1/+1 counters to be
put on this creature in any way.
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
All come, to be never found again.