Obsidian Karoo enters the battlefield tapped.
, Pay 1 life: Add or to your mana pool.
, , Sacrifice Obsidian Karoo: Draw a card.
: Obsidian Karoo becomes a 2/1 black and white Wizard Skeleton creature until end of turn. It's still a land.
, Pay 1 life: Add 
or 
to your mana pool.
, , Sacrifice Obsidian Karoo: Draw a card.: Obsidian Karoo becomes a 2/1 black and white Wizard Skeleton creature until end of turn. It's still a land.
