Murderous Mystic

When Murderous Mystic enters and
you lost life this turn, he gains Haste.

If atleast 1 creature died this turn, you may sacrifice Murderous Mystic and search your
deck for a card named "Jhin,Hallow of Death". Until the end of your turn, you may cast that card, by paying between 1 and 4 life
instead of it's mana cost.