Mourner of the Lost

{t}, {b/g}: Look at the top card of your library,
you may put it into your graveyard.
At the beginning of your upkeep if Mourner
of the Lost is in your graveyard you lost 1 life.
Exile ten cards from your graveyard: prevent
it to be exiled ou shuffled by your opponents.
Play this abillity only if Mournerof the Lost
is in your graveyard.