Greyholdt Citizenship

Enchant Creature
Enchanted creature gains Disinter {x}{b}, where X
is half its converted mana cost, rounded down.
(When this creature is sent to a graveyard, you may
pay its Disinter cost. If you do, return it to the battlefield tapped. It is a Zombie in addition to its
other types.)
"Residents of Greyholdt enjoy various benefits: a
trading permit, affordable housing, and undead immortality."