Death Star, Planet Killer

Death Star, Planet Killer enters the battlefield
tapped unless an opponent lost life this turn.
{t}: Add {u}, {b}, or {r} to your mana pool.
At the beginning of your end step, if a player
has 5 or less life, destroy target nonbasic land.
"I felt a great disturbance in the Force. As if
millions of voices suddenly cried out in terror and
were suddenly silenced." ~ Obi-Wan Kenobi