Liliana's Influence is a rare Sorcery card from Amonkhet (AKH), collector number 277. Current market price: $0.29, TCGplayer market prices via Scryfall.
Put a -1/-1 counter on each creature you don't control. You may search your library and/or graveyard for a card named Liliana, Death Wielder, reveal it, and put it into your hand. If you search your library this way, shuffle.