MAGIC: THE GATHERING
Thornwood Falls enters the battlefield tapped.
When Thornwood Falls enters the battlefield, you gain 1 life.
: Add or to your mana pool.
The "gain lands" were originally printed in Khans of Tarkir, where they enabled 5-color morph decks in Limited. They're among the best mana-fixing lands you'll find at common, whether you're playing Pauper or building a budget Commander deck.