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