Razaketh, the Foulblooded is a mythic Legendary Creature — Demon card from Hour of Devastation (HOU), collector number 73. Current market price: $13.51 (foil $22.03), TCGplayer market prices via Scryfall.
Flying, trample Pay 2 life, Sacrifice another creature: Search your library for a card, put that card into your hand, then shuffle.