When Shelldock Ampitheater enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
: Add to your mana pool. Put Shelldock Ampitheater on top of your library.
, : Shuffle your library.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Shelldock Ampitheater on top of your library., : Shuffle your library.
