Riozhar, Fallen Dreadlord

Eminence- Whenever a non-token Zombie you
control enters the battlefield, if Riozhar,Fallen Dreadlord is on the battlefield or in the command
zone you may pay 4 life, if you do put two 3/3
zombie horror tokens onto the battlefield.
Other zombies you control get +1/+1
Whenever another zombie you control dies return
target creature from your graveyard to your hand
with less or equal converted mana cost.