Reivar, Master of the Void

Upon entering the field he summons a 5/3 Shadow Demon token that can not be destroyed in any way but is removed if Reigar is sent from the field.
{1}{b} Reivar can not be the target of any card effects this turn.
{1}{b} To place one counter on a Shadow Demon token.
{1}{b} To summon a 1/1 Shadow Demon token.