Hynafol, The Mirage

As long as an opponent hasn't tapped Hynafol, it
is not an Enchantment Creature and is a Desert
in addition to its other subtypes.
As long as Hynafol is an Enchantment Creature
it is also a Snake in addition to its other subtypes.
{t}: Add {w}{w} to your mana pool. Activate this
ability only if Hynafol is a Desert and it is your
turn.