Best Token Generator (Black)

Hi,

i m trying to build around [[Roshan, Hidden Magister]], turning all my stuff into assassins and therefore all benefitting from the same anthems like [[Banner of Kinship]].

For this I am looking for ways to easily/repeatedly create creature tokens to increase my army. So which do you think does this job best? The one that makes 13 zombies is quite expensive...

I myself like [[Abhorrent Overlord]] due to it being flickerable/revivable.

So TLDR; apart from the already mentioned ones, what cards in black do you think are best suited to create lots of creature tokens on their own (without specific sacc outlet requirements like [[Pawn of Ulamog]]).

THX