(Fire-Lit Marsh isn't a spell.)
Fire-Lit Marsh enters the battlefield tapped unless you control an enchantment.
Attacking creatures you control get +1/+0.
: Add or to your mana pool.
Put Fire-Lit Marsh on top of your library: Add to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. 
