Lady of the Novecerta

Flying, vigilance, trample
Lady of the Novecerta's power and toughness are each equal to either 5 or the highest mana cost among dragons you control, whichever is greater.

As long as you have 30 or more life, Lady of the Novecerta isn't a creature.

You may look at the top card of your library at any time, and cast enchantments off the top of your library by paying 2 life in addition to it's other costs.