(Dormant Meadow isn't a spell.)
Dormant Meadow enters the battlefield tapped unless you control an enchantment.
Sacrifice a land: You gain 1 life.
: Add or to your mana pool.
Put Dormant Meadow on top of your library: Add to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. 
