Boratoros, Head of the Guard

Whenever a creature with power 5 or greater enters
under an opponent's control, put a +1/+1 counter on Boratoros Titanbane.

If a creature you control with power of 2 or less
would die, instead shuffle it into your library, then
reveal the top card of your library. If it's a land, put
it into play, tapped.

Even if I have to give my life, assassin witch, you
will not reach my king.