Ark Of The Covenant

Human Creatures you control have Indestructible
and Hexproof.
At the end of your Upkeep, if you control no
Human creatures, sacrifice Ark of the Covenant.
"There I will meet with you; and from above the mercy
seat, from between the two cherubim which are upon
the ark of the testimony, I will speak to you about all
that I will give you in commandment for the sons
of Israel." - Exodus 25:22