(: Add or to your mana pool.)
Graven River enters the battlefield tapped unless you pay .
: Graven River becomes a 1/1 blue and red Troll creature with first strike until end of turn. It's still a land.
: Add 
or 
to your mana pool.)
.
: Graven River becomes a 1/1 blue and red Troll creature with first strike until end of turn. It's still a land.
