The reasons: Unlike Relic of Progenitus, Unlicensed Hearse targets specific cards you want out of your opponents graveyard
Stonehoof Chieftain and Lightning Greaves are the only other pieces at the $10+ range, notably with a very different level of reprints
Whats more, you can add card-draw punishment or discard payoffs with cards like Sheoldred, the Apocalypse or Waste Not
Black Market Connections Black Market Connections is such a nice way to convert life into resources every turn, and with typal decks you can get a 3/2 changeling creature every turn
The commander, Winter, Cynical Opportunist, is spectacular because of his strong abilities that do exactly what you need, and the entire deck has plays that other decks cannot pull off
It costs just 4 mana for a 5/4 as well, making it playable in even an aggressive deck that might not play dragons as big as they could be