Rogue of the Old Ways

Delve (Each card you exile from your graveyard
while casting this spell pays for {1}.)
Outlast {b/g}, put the top card of your library into
your graveyard ({b/g}, put the top card of your library
into your graveyard, {t}: Put a +1/+1 counter on this creature. Outlast only as a sorcery.)
Whenever a creature you control dies, if it had
one or more +1/+1 counters on it, you may
exile three other cards from your graveyard.
If you do, return that card to its owner's hand.