Prime Speaker Vannifar is a mythic Legendary Creature — Elf Ooze Wizard card from Ravnica Allegiance (RNA), collector number 195. Current market price: $8.68 (foil $32.54), TCGplayer market prices via Scryfall.
{T}, Sacrifice another creature: Search your library for a creature card with mana value equal to 1 plus the sacrificed creature's mana value, put that card onto the battlefield, then shuffle. Activate only as a sorcery.