Ygori, Lord Of Entropy

When Ygori, Lord Of Entropy Enters the battlefield, destroy each creature with a -1/-1 counter on it.
At the beginning of your upkeep, put a -1/-1 counter on each creature that does not have one and remove a +1/+1 counter from each creature that has one, then put a -1/-1 counter on each creature that does not have a +1/+1 counter on it.
{u}{b}, discard 2 cards and sacrifice Ygori, Lord Of Entropy: Move a -1/-1 counter from each of your creature to any other creature.