At the beginning of your end step, if you didn't cast any spells this turn, Cave-wood deals 1 damage to you.

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

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

: Cave-wood becomes a 1/1 red and green Elemental Giant creature with first strike until end of turn. It's still a land.