Sandstorm Elemental

Trample, vigilance
When Sandstorm Elemental enters the battlefield, tap all lands.
Lands do not untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player untaps half of his or her lands, rounded up, at random.
At the beginning of your upkeep, Sandstorm Elemental deals 1 damage to each player.
"Poof."