Courageous Resolve 
Instant
$0.60 #10290 0.06 2.8 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.
Herald of Eternal Dawn80%
$1.33↑#4246↑0.78↑1.8 years↓
"You can't lose the game and your opponents can't win the game."
Crypsis78%
$0.08↓#16804↓0.0012.6 years↑
"Target creature you control gains protection from creatures your opponents control until end of turn. Untap it."
Platinum Angel76%
$9.06↑#1772↑1.02↑22.9 years↑
"You can't lose the game and your opponents can't win the game."
Shelter74%
$0.19↓#3294↑0.20↑24.9 years↑
"Target creature you control gains protection from the color of your choice until end of turn."
Angel's Grace70%
$3.07↑#1983↑0.73↑19.9 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."
Blessed Breath70%
$0.24↓#16163↓0.29↑21.9 years↑
"Target creature you control gains protection from the color of your choice until end of turn."
Gods Willing70%
$0.09↓#3489↑0.18↑12.9 years↑
"Target creature you control gains protection from the color of your choice until end of turn."
Stave Off70%
$0.09↓#15676↓0.0015.1 years↑
"Target creature gains protection from the color of your choice until end of turn."