Paradise Dome

Paradise Dome enters the battlefield tapped.
When Paradise Dome enters the battlefield, return a land you control to your hand. If the land returned to your hand this way was a forest, gain one life.
{t}: Add {1}{g} to your mana pool. Gain 1 life.
{t}: Gain 2 life.
When Paradise Dome leaves the battlefield, discard a card or lose 3 life.