A Good Thing 
Enchantment
Spells and abilities you control can't destroy, exile, target, or cause you to sacrifice A Good Thing. At the beginning of your upkeep, double your life total. Then, if you have 1,000 or more life, you lose the game.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL