Kavin, Betrayer God

Eminence - At the beginning of your upkeep,
create a Power Core token with "{t}, Sacrifice this
artifact: add one mana of any color to your mana
pool."
Hexproof, Indestructible
As an additional cost to cast this card, sacrifice
three creatures.
Whenever you cast an instant, sorcery, or artifact spell, you may pay {2}. If you do, copy it
and you may choose new targets.