Lorehold, the Historian

Miracle is an alternative cost to cast the spell with miracle. It can't be combined with other alternative costs, such as casting a spell "without paying its mana cost." You may, however, pay additional costs, such as kicker. If the spell has any mandatory additional costs, those must be paid to cast the spell.

To determine the total cost of a spell, start with the mana cost or alternative cost (such as a miracle cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.

You still draw the card whether you use the miracle ability or not. Any ability that triggers whenever you draw a card, for example, will trigger. If you don't cast the card using its miracle ability, it will remain in your hand.