(: Add or to your mana pool.)
River Lowlands enters the battlefield tapped unless you control an enchantment.
: River Lowlands becomes a 2/1 blue and white Crab creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): River Lowlands becomes a 2/1 blue and white Crab creature until end of turn. It's still a land.
