(: Add or to your mana pool.)
Horizon River enters the battlefield tapped unless you control two or more creatures.
: Horizon River becomes a 1/1 white and blue Cleric creature with flying until end of turn. It's still a land.
: Add 
or 
to your mana pool.)
: Horizon River becomes a 1/1 white and blue Cleric creature with flying until end of turn. It's still a land.
