Rith, the Awakener

Legendary Creature - Dragon 6/6, 3WRG (6)
Flying
Whenever Rith, the Awakener deals combat damage to a player, you may pay {2}{G}. If you do, choose a color, then put a 1/1 green Saproling creature token onto the battlefield for each permanent of that color.¹
Illus. Todd Lockwood

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: You choose the color during resolution. This means your opponent does not get to react after knowing the color you chose.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (2/7)	From the Vault: Dragons (Rare) Invasion (Rare)