Hancock isnt the only mono-black zombie commander in EDH, but it is the only zombie lord that starts in the command zone, and it takes relatively little effort for this creature to outpace the standard +1/+1 buff
Heralds HornHeralds Horn does its best, but giving us card draw is only half of what we want this card to do for us
In a deck with Entomb style effects for Gisela and creature tutors for Bruna, it may not be too far-fetched to combine them, but its still a lot of hoops to jump through
I do, however, think it can lead to unfun games for people, which I believe was demonstrated on Game Knights
Powerful cards like Dark Confidant, Bitterblossom, and others offer powerful upkeep triggers for Commander games
Does that card make the less of a social game, does the card discourage creative deck design by being so efficient that it pushes out other cards, and does the card fit into the long-term stability of the format