The Natural Law

At the beginning of each end step, put a -1/-1
counter on each non-Angel, non-God creature.

"The Sun's rays carry the laws of nature to the earth,
which we must follow. The Sun dictates that all living things must eventually have their time. It is incontravertible. It is inevitable. Accept His gifts,
accept ageing, accept withering. Embrace inevitable
death."
-Prophet Miserus Luminous, 'Sermon on the Fourth
Vision'