Froslass, Siren of the Wastes

Froslass has shroud, first strike, and shadow
as long as you control two or more snow lands.
Froslass, Siren of the Wastes's power is equal
to the number of snow lands on the battlefield.
{1}{w/u}{s}: Tap target creature. It doesn't untap
during its controller's next untap step.
It freezes foes with an icy breath nearly -60 degrees F.
What seems to be its body is actually hollow.