Baelor I, The Blessed

When a non land card enters the battlefield flip
a coin, if you win the toss you may exile that card.
If you lose the toss sacrifice Baelor I, The Blessed.
If this card is put into the graveyard instead put it
on the bottom of your library. Then shuffle your library.
"He was a rare spirit, pure and brave and innocent, untouched by the evils of the world."