(Gilt-Leaf Coliseum isn't a spell.)
Gilt-Leaf Coliseum enters the battlefield tapped unless you pay 3 life.
All creatures have Forestwalk.
: Add or to your mana pool.
: Add to your mana pool. Put Gilt-Leaf Coliseum on top of your library.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Gilt-Leaf Coliseum on top of your library.
