(: Add or to your mana pool.)
When Farm Oasis enters the battlefield, sacrifice it unless you pay 3 life.
: Farm Oasis becomes a 2/1 white and green Citizen creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Farm Oasis becomes a 2/1 white and green Citizen creature until end of turn. It's still a land.
