Ishirut, the Necrodrage

Zombies you control get +1/+1
Dragons you control get +1/+1
Whenever a creature you control dies, exile it
and create a 2/2 dragon. If it was a dragon, then
create a copy that is a token of it instead, except
it is a black zombie in addition to it's types and
colors, then take damage equal to it's converted
mana cost.