Courageous Resolve 
Instant
$0.48 #10514 0.48 3.0 years
Up to one target creature you control gains protection from each of your opponents until end of turn. Draw a card. (It can't be blocked, targeted, dealt damage, enchanted, or equipped by anything controlled by those players.)
Fateful hour — If you have 5 or less life, you can't lose life this turn, you can't lose the game this turn, and your opponents can't win the game this turn.
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Cards similar to Courageous Resolve expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
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Crypsis78%
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"Target creature you control gains protection from creatures your opponents control until end of turn. Untap it."
Platinum Angel76%
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"You can't lose the game and your opponents can't win the game."
Shelter74%
$0.19↓#3327↑0.15↓25.1 years↑
"Target creature you control gains protection from the color of your choice until end of turn."
Darksteel Angel71%
$3.81↑#7408↑0.88↑0.0 years↓
"You can't lose the game and your opponents can't win the game."
Angel's Grace70%
$3.30↑#1940↑0.84↑20.0 years↑
"You can't lose the game this turn and your opponents can't win the game this turn. Until end of turn, damage that would reduce your life total to less than 1 reduces it to 1 instead."