Cheapest priced copy (Masters 25): $0.79 at Card Kingdom, near mint, their price list as of .
Fortune Thief 
Creature — Human Rogue · 0/1 · Rare · Time Spiral · #156
Damage that would reduce your life total to less than 1 reduces it to 1 instead.
Morph {R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.79 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Masters 25 | 130 | Rare | $0.79 | $1.49 |
| Time Spiral | 156 | Rare | $0.79 | $1.99 |
5 rulings from Wizards of the Coast
- 16 March 2018If your life total is less than 1 but you've somehow avoided losing the game, Fortune Thief's effect won't apply at all if you're dealt damage.
- 16 March 2018Fortune Thief's effect applies only if your life total is being reduced by damage. Other effects or costs (such as losing or paying life) can reduce your life total below 1 as normal.
- 16 March 2018Fortune Thief's effect is not a prevention effect. It stops unpreventable damage from reducing your life total below 1.
- 16 March 2018Fortune Thief doesn't change how much damage is dealt; it just changes how much life that damage makes you lose. Abilities such as lifelink will see the full amount of damage being dealt.
- 16 March 2018Fortune Thief won't prevent you from losing the game if your life total becomes 0 or less or if some other effect causes you to lose the game.