Verdant Chamber
Land (Rare)

When Verdant Chamber enters the battlefield, you lose 2 life unless you reveal a Snake card from your hand.

Tap: Add 1 to your mana pool.

Tap: Add G or U to your mana pool. Each opponent gains 1 life.

1U: Verdant Chamber becomes a 1/1 green and blue Treefolk creature with flying until end of turn. It's still a land.

Lars Staples