Fill the Graves

Each player puts the top four cards of their
library into their graveyard.
Gravelife -- If Fill the Graves is put directly from
your library into your graveyard, each player puts
the top two cards of their library into their
graveyard. Then, if a graveyard has twenty or
more cards in it, return Fill the Graves to its
owner's hand.
"Keep your arrows. I use a different ammunition."