In addition to going for Auras that make Hakim into a threat, you can also use him as a value engine of sorts
Key Enablers This should go without saying, but if you're drafting a dedicated mill-yourself deck, you're going to need a lot of ways to put cards into your own graveyard
Sky Swallower All
Thanks to the Reserved List preventing specific reprints, some MTG cards have been enshrined into the annals of History
They also have an ability that reads, Whenever a player attacks one of your opponents, if that opponent has more life than another of your opponents, that attacking player draws a card, and you put two +1/+1 counters on a creature you control. While this isnt a traditional approach to a +1/+1 counter deck, having a slightly more political flavor to the whole affair can be a lot of fun
Its not always easy to measure how effective is the card draw is, but most deckbuilders count as card draw only cards that net 2+ cards in hand