Obsidian Key enters the battlefield tapped.
, : Add to your mana pool.
: Obsidian Key becomes a 2/1 black and blue Wizard creature until end of turn. It's still a land.
, 
: Add 
to your mana pool., : Add to your mana pool.: Obsidian Key becomes a 2/1 black and blue Wizard creature until end of turn. It's still a land.
