Feast of the Victorious Dead is a uncommon Enchantment card from March of the Machine: The Aftermath (MAT), collector number 210. Current market price: — (foil $1.87), TCGplayer market prices via Scryfall.
At the beginning of your end step, if one or more creatures died this turn, you gain that much life and distribute that many +1/+1 counters among any number of creatures you control.