Rith, the Awakener is a rare Legendary Creature — Dragon card from Invasion (INV), collector number 267. Current market price: $1.85 (foil $115.09), TCGplayer market prices via Scryfall.
Flying Whenever Rith deals combat damage to a player, you may pay {2}{G}. If you do, choose a color, then create a 1/1 green Saproling creature token for each permanent of that color.