Vona's Hunger is a rare Instant card from Rivals of Ixalan Promos (PRIX), collector number 90p. Current market price: $13.45 (foil $13.98), TCGplayer market prices via Scryfall.
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Each opponent sacrifices a creature of their choice. If you have the city's blessing, instead each opponent sacrifices half the creatures they control of their choice, rounded up.