Raven's Eye, Asperoth Capital

({t}: Add {b} or {g} to your mana pool.)
Raven's eye enters the battlefield tapped.
Whenever an elf enters the battlefield under your control, you gain 1 life.
Asperoth, also known as The Poison Jungle or The
Spider Rainforest. Its capital, Raven's Eye, lies deep
within the heart of the jungle.