Most aristocrat decks are heavily associated with the color black, as it provides the most support for both sacrifice outlets and cards that benefit from creatures dying
If they happen to over-commit by trashing too many cards in hand and end up not closing out the game, theyll be at risk of losing on the upcoming attack to your attacks
You only draw cards if your attacking creatures die, and thats usually not very good
Many small pieces
As their text suggests, the cards are intended to be thrown away during the production of Lorcana cards in the factory - making the very few that slip through and make it into a booster pack especially rare
Then as your vehicles deal combat damage to your foes, you exile that many cards from their library and you can play them, although there is no mana-washing here, so in a mono-Blue deck you might find it rough to cast non-Blue, non-colorless cards