Jackal Necromancer

{t} Create a 2/2 black zombie token, tapped, and
attacking
{t}, {b} Amass 2: (Put two +1/+1 counters on
a black Zombie Army you control. If you don't
control one, create a 0/0 black Zombie Army
creature token first.)
Casting amass does not untap creature during
your next upkeep.