(Obsidian Woodlot isn't a spell.)

Obsidian Woodlot enters the battlefield tapped unless you pay 2 life.

Obsidian Woodlot is indestructible. (Destroy effects and lethal damage don't destroy it.)

: Add  or to your mana pool.

: Add  to your mana pool. Put Obsidian Woodlot on top of your library.