Legions Unending

When you amass, you may do so as though you controlled no armies.
Sacrifice a creature: Put a +1/+1 counter on each army you control. Armies you control gain deathtouch until end of turn.
{2}{b}{b}: Amass 1 (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.)