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