Blood Speaker is a uncommon Creature — Ogre Shaman card from Champions of Kamigawa (CHK), collector number 103. Current market price: $0.42 (foil $13.25), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may sacrifice this creature. If you do, search your library for a Demon card, reveal that card, put it into your hand, then shuffle. Whenever a Demon you control enters, return this card from your graveyard to your hand.