When Pinecrest Coliseum enters the battlefield, return a land you control to its owner's hand.

When Pinecrest Coliseum enters the battlefield, put a land you control on the bottom of its owner's library.

: Add  to your mana pool.

: Pinecrest Coliseum becomes a 2/2 green and blue Leech creature with trample until end of turn. It's still a land.