(: Add or to your mana pool.)
Centaur River enters the battlefield tapped.
: Centaur River becomes a 2/1 green and blue Treefolk creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Centaur River becomes a 2/1 green and blue Treefolk creature until end of turn. It's still a land.
