Polar Midnight

When Polar Midnight enters the battlefield,
nonsnow creatures get -3/-0 until end of turn.
Whenever a creature's power is reduced to 0 or
less, destroy it.
{1}{s}, Sacrifice a snow land: Target creature gets
-3/-0 until end of turn. At the beginning of the
next end step, if one or more creatures died this
turn, draw a card.