Players are loathe to see their favourite cards go, or their tournament-winning combos rendered useless or unreliable
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
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

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Today I would like to share with you a deck called: Labrynth 4
Dross Skullbomb: three mana to draw two in black, when one is guaranteed to be a card you want from the yard