Search your library for a basic land card and put that card onto the battlefield. Then shuffle your library.

Look at the top five cards of target player's library. You may then have that player shuffle that library.

All creatures lose flying until end of turn.
Sacrifice a snow land: Return Whiteout from your graveyard to your hand.

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Withering Wisps.
: Withering Wisps deals 1 damage to each creature and each player. Activate this ability no more times each turn than the number of snow Swamps you control.