Krosan Tomb
Land (Rare)

When Krosan Tomb enters the battlefield, you lose 1 life unless you reveal an artifact land card from your hand.

Tap: Add G to your mana pool. Activate this ability only if you control a Forest.

Tap: Add B to your mana pool. Activate this ability only if you control a Swamp.

2: Krosan Tomb becomes a 2/2 green Stag creature until end of turn. It's still a land.

Allan Staples