Casimir, Lord of Shadows

{p/b} or sacrifice a creature:{ut}
{t}:Prevent all damage to target creature this turn.
{t}:Put a +1/+1 on target creature
Whenever a creature comes into play you may pay {u/b}{u/b}{u/b}{u/b}{u/b} to gain control of it, if you do,
sacrifice Casimir, Lord of Shadows
If a Casimir Creature or Planes Walker would enter your graveyard, shuffle it into your library instead.