Fortune Thief
Creature — Human Rogue
Damage that would reduce your life total to less than 1 reduces it to 1 instead.
Morph (You may cast this card face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
Christopher Moeller
Masters 25 (A25)
• #130Rulings
If 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.
(wotc • 2018-03-16)
Fortune 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.
(wotc • 2018-03-16)
Fortune Thief's effect is not a prevention effect. It stops unpreventable damage from reducing your life total below 1.
(wotc • 2018-03-16)
Fortune 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.
(wotc • 2018-03-16)
Fortune 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.
(wotc • 2018-03-16)
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Rulings
If 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.
(wotc • 2018-03-16)
Fortune 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.
(wotc • 2018-03-16)
Fortune Thief's effect is not a prevention effect. It stops unpreventable damage from reducing your life total below 1.
(wotc • 2018-03-16)
Fortune 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.
(wotc • 2018-03-16)
Fortune 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.
(wotc • 2018-03-16)