Yrahsh, The First Soul

When Yrahsh is summoned, destroy all other creatures on the battlefield, and summon them as 0/1 White Wisp creature tokens.
For each Wisp creature token on your battlefield, grant Yrahsh +1/+1
When it was born, the world was dry and soulless. He came to bring souls back, but we have a tendency to kill that which we don't understand and which we want. I think we were given a much harsher deal