Altar of Indifference

Sacrifice a creature: Creatures you control
gain shroud until end of turn. (They can't
be the targets of spells or abilities.)
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"Some evils prefer secrecy. Others delight in
living in the dark, and welcome whoever will
join them. But are the dead of Culthere evil?
No, they simply wish to keep to themselves."
—Osiris, Lithbearer