Grimoire of Whispers

Altered (This spell must be cast using void mana)
At the beginning of your upkeep, pay {1} or sacrifice Grimoire of Whispers.
If Grimoire of Whispers would enter the graveyard from anywhere, instead exile it and put a 2/2 black Demon creature token onto the battlefield with "At the beginning of your upkeep, this creature deals 1 damage to you."