Platinum Beacon

Flash, Protection from colored spells.
Platinum Beacon enters the battlefield with 2
Time Counters on it. At the beginning of your
upkeep, remove a Time Counter from Platinum Beacon, then, if there are no Time Counters on Platinum Beacon, sacrifice it, you lose the game.
As long as Platinum Beacon is on the battlefield,
its owner can't lose the game, and opponents
can't win the game.