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

: 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 Mountain.

: Thicket Sandstone becomes a 2/2 green Leech creature until end of turn. It's still a land.