Swamp Knoll enters the battlefield tapped unless you control one or more creatures.
: Add or to your mana pool.
: Swamp Knoll becomes a 2/1 black and red Rat creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.: Swamp Knoll becomes a 2/1 black and red Rat creature until end of turn. It's still a land.
