Vona's Hunger is a rare Instant card from Rivals of Ixalan (RIX), collector number 90. Current market price: $5.89 (foil $9.92), 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.