Vona, Butcher of Magan is a mythic Legendary Creature — Vampire Knight card from Ixalan (XLN), collector number 231. Current market price: $0.34 (foil $6.06), TCGplayer market prices via Scryfall.
Vigilance, lifelink {T}, Pay 7 life: Destroy target nonland permanent. Activate only during your turn.