Jyffgrif, King of Tombs

Each time a Zombie creature you control attacks,
you may surveil 1.
Each time a non-token Zombie creature you
control die, amass 2. Jyffgrif deal 2 damage to
any target.
{4}{u}{b}{r}: Create X 0/0 Zombie Army creature
tokens that enter the battlefield with X +1/+1 counters on them where X is the number
of Zombies you control.