Doom Whisperer

Doom wisperers are one of the manny demons that break through into ravnica in the crazy rituals of the rakdos. These demons often dont affiliate with anyone and prefer to wisper secrets into the ears of curious mortals. Those that listen for too long are absorbed into the Demons soul and nothing of them remains except a desperate new hand that grasps for anything it can hold and tries to pull itself out of the demonic host.

Refferences:

https://scryfall.com/card/grn/69/doom-whisperer