The Night King

Whenever you cast an instant spell, create a 2/2
blue Zombie creature token.
Whenever you cast a sorcery spell, 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.)
"An endless night. He wants to erase this world,
and I am its memory." -Bran Stark