(: Add or to your mana pool.)
Obsidian Ruins enters the battlefield tapped unless you pay .
: Obsidian Ruins becomes a 2/2 blue Crab creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.)
.
: Obsidian Ruins becomes a 2/2 blue Crab creature until end of turn. It's still a land.
