Sinister Offerings

Search your library for a card, put that card into your hand, then shuffle.
Omen 3 - {1}{b}
(Rather than cast this card from your hand, pay {1}{b} and exile it with three time counters on it. When the last counter is removed, cast it without paying its mana cost.)
Whenever a creature you control dies, remove a time counter from Sinister Offerings.