Trostani, Three Whispers is a mythic Legendary Creature — Dryad card from Murders at Karlov Manor (MKM), collector number 322. Current market price: $2.58 (foil $7.41), 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.