Intervention Pact (FUT) from Future Sight, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Dave Kendall
• Card Text:
  Intervention Pact is white.
  The next time a source of your choice would deal damage to you this turn, prevent that damage. You gain life equal to the damage prevented this way.
  At the beginning of your next upkeep, pay 1WW. If you don't, you lose the game.