Yearn of the past

When Yearn of the past enters the battlefield, put the top four cards of your library in to your graveyard.
Whenever a creature you control dies, you may flip a coin, if you win the flip, put a random card form your graveyard in to your hand. if you loose the flip, you loose 2 life.
The longing of lost loved ones have driven many to lengths of desperation that could as easily end up in even more despair.