Indestructible
When Zodiark enters, each player sacrifices half the non-God creatures they control of their choice, rounded down.
Whenever a player sacrifices another creature, put a +1/+1 counter on Zodiark.
While resolving Zodiark's second ability, you choose half the non-God creatures you control (rounded down), then each other player in turn order does the same. Then each of the chosen creatures are sacrificed simultaneously.