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

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

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

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