(Moor Aqueduct isn't a spell.)
Moor Aqueduct enters the battlefield tapped.
Discard two cards: Put a 2/2 black Zombie creature token onto the battlefield.
: Add or to your mana pool.
Put Moor Aqueduct on top of your library: Add to your mana pool.
: Add 
or 
to your mana pool.
to your mana pool. 
