Farosh, Spirit of the Falls

Flying, Hexproof
Whenever Farosh is dealt damage, create a
colorless Treasure artifact token with "{t},
Sacrifice this artifact: Add one mana of any color."
Making its home in the Faron region, it's said to have served the Spring of Courage since ancient times. And
old saying goes, "The dragon ascends to the heavens
as the sun begins to set." but nobody has seen this in
the current age.