Path of Necromancy

At the beginning of your upkeep, create 3 0/0
black Zombie Army creature tokens. They enter
the battlefield with X +1/+1 counters, where
X is your devotion to black. Then, as soon as you
have more than 13 black Zombie Army creature
tokens, sacrifice them all. All creatures you
control gain deathtouch and +Y/+Z, where Y is
their combined power and Z is their combined
toughness.