Trostani, Three Whispers is a mythic Legendary Creature — Dryad card from Murders at Karlov Manor Promos (PMKM), collector number 238p. Current market price: $0.51 (foil $0.64), TCGplayer market prices via Scryfall.
{1}{G}: Target creature gains deathtouch until end of turn. {G/W}: Target creature gains vigilance until end of turn. {2}{W}: Target creature gains double strike until end of turn.