Keeper of Progenitus

Creature - Elf Druid 1/3, 3G (4)
Whenever a player taps a Mountain, Forest, or Plains for mana, that player adds one mana to his or her mana pool of any type that land produced.
He watches over the valley where Progenitus sleeps, culling signs from its steaming breaths.
Illus. Kev Walker

Format Legality	Legal in Vintage, Legacy, Extended, Standard
Printings (1/9)	Shards of Alara (Rare)