While this ability is the most clearly weaker than Ajani Vengeant of all of his abilities, it is this ability combined with the ability to make mana that I think really makes the card
Dross Skullbomb: three mana to draw two in black, when one is guaranteed to be a card you want from the yard
If you have no interest in Haxorus, it's completely skippable, but if you end up cracking packs and having a ton of excess, try a deck out with it
According to Mark Rosewater, this was done so that the product could be advertised as having "over 300 cards"
Wort, Boggart Auntie Wort, Boggart Auntie is one of the O.G
Rather like how you can try to bait out a board wipe by applying enough pressure that your opponent has to cast it without playing all your creatures, a bit of self-mill can prompt your opponent to crack these before they want to