Zodiark, Unsundered

Indestructible
As long as your devotion to red and black is less than 5, Zodiark isn't a creature
If Zodiark attacks, double the power and toughness of one creature you control until the end of combat.
At the beginning of your upkeep, you may sacrifice any number of creatures you control, and if you do, place creatures on the battlefield from your graveyard equal to the number of creatures sacrificed to activate this effect. Exile the creatures placed on the battlefield by this effect at the beginning