Exousía, Shiphon of Life

Ward--Pay 2 Life.
When Exousia, Shiphon of Life enter the
battlefield, Amass Power 2. (Put two Power
counter on this permanent. Remove one at
your upkeep. When, the last one is removed,
this permanent become Unleash.)
When Exousia, Shiphon of Life become Unleash,
destroy all creatures you don't control.