All Hallow's Eve

You may search through your library and/or graveyard for a card named The Headless
Horseman, reveal it, and put it in your hand.
If you search your library this way, shuffle it.
Trick or Treat: All players draw a card. If card is
not a land of any kind, then player puts three
-1/-1 counters on creatures of their selection. If
player has no creatures or does not wish to put counters on creatures, he or she is dealt 5 damage.