Jiiro, Cursed by Witches

At the beginning of each upkeep, you sacrifice another creature and you lose 3 life. If a creature is sacrificed this way, put a heart counter on Jiiro, Cursed by Witches.
{b}{g}, Remove a heart counter from Jiiro, Cursed by Witches: Create a 5/5 black and green Demon Spirit creature token with flying, haste, trample, and "At the beginning of the next end step, sacrifice this creature."