Olzret, The Taker of Life

Flying
If Olzret, The Taker of Life is in your hand, you
may put him into your graveyard and pay {x}. If
you do, each opponent loses X life.
You may cast Olzret, The Taker of Life from
your graveyard.
{2}{b}: Return Olzret, Taker of Life from the battlefield to your hand.