(: Add or to your mana pool.)
Arid Knoll enters the battlefield tapped unless you pay .
: Arid Knoll becomes a 2/1 white and red Knight creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.).: Arid Knoll becomes a 2/1 white and red Knight creature until end of turn. It's still a land.
