Hades, Lord of the Dead

Eminence As long as Hades, Lord of the Dead is
in the command zone or on the battlefield,
Whenever a nontoken creature your opponent controls dies, you can pay {1} to create
a 1/1 Spirit token with flying.
When Hades, Lord of the Dead attacks you may sacrifice any number of Spirits,
if you do put a +1+1 on Hades, Lord of the Dead
for each Spirit sacrificed this way.