(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.