The Crucible of Life

Shroud
When the Crucible of Life enters, reveal the top twelve cards of your library. Exile all creature cards revealed this way, then put the rest on the bottom
of your library in a random order.
When the Crucible of Life leaves the battlefield, put all cards exiled with it onto the battlefield.
At the beginning of your upkeep, if you control no creatures, exile the Crucible of Life.
When it broke, life was born.