Tree Chamber enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Tree Chamber on top of your library: Add to your mana pool.
: Tree Chamber becomes a 2/2 blue Shapeshifter creature until end of turn. It's still a land.
.
: Add 
or 
to your mana pool.
to your mana pool. : Tree Chamber becomes a 2/2 blue Shapeshifter creature until end of turn. It's still a land.
