(Shelldock Timberland isn't a spell.)
Shelldock Timberland enters the battlefield tapped unless you control two or more creatures.
Green spells cost more to play.
: Add or to your mana pool.
Sacrifice Shelldock Timberland: Add or to your mana pool.
more to play.
: Add 
or 
to your mana pool. or to your mana pool.
