Ferryman's Favor

At the beginning of your upkeep, put all exiled
cards you own with favor counters on them into
your graveyard.
{4}:Put a favor counter on an exiled card you own.
"All souls go to Stygia, and returning from there is not
impossible. But for those who go elsewhere, you need
the help of a Ferryman."
~Uriveil, Vox Mortu