He is a double looter with haste that can also Control Artifact
Compare with Primeval Titan (Trample Whenever Primeval Titan enters the battlefield or attacks, you may search your library for up to two land cards, put them onto the battlefield tapped, then shuffle your library.) Primeval Titan feels Mythic and is a Modern staple
You get a 4/4 for Jeskai mana, who can auto-equip something at the beginning of combat on your turn
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
If you see this in the command zone, be prepared for some unfair Magic
But it is still hard-banned in Commander, which has become a rarity in the bracket era, because its ability to completely ruin the day of at least one player at the table is just too brutal for the format to handle