To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Advanced Reconstruction's level 3 ability). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.

If multiple cards leave your graveyard at the same time, Advanced Reconstruction's level 2 ability will trigger only once.

You pay all costs and follow all timing rules for cards played this way. For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty and only if you have an available land play remaining.