River Carnarium enters the battlefield tapped.
: Add or to your mana pool.
Put River Carnarium on top of your library: Add to your mana pool.
: River Carnarium becomes a 2/1 blue and black Fish creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.
to your mana pool. : River Carnarium becomes a 2/1 blue and black Fish creature until end of turn. It's still a land.
