Trostani Discordant is a mythic Legendary Creature — Dryad card from Ravnica: Clue Edition (CLU), collector number 213. Current market price: $0.30, TCGplayer market prices via Scryfall.
Other creatures you control get +1/+1. When Trostani enters, create two 1/1 white Soldier creature tokens with lifelink. At the beginning of your end step, each player gains control of all creatures they own.