Beacon of Immortality 
Instant
$14.64 #2920 0.47 22.4 years
Double target player's life total. Shuffle Beacon of Immortality into its owner's library.
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Cards similar to Beacon of Immortality 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.
Beacon of Tomorrows76%
$3.17↓#6221↓1.09↑22.4 years
"Target player takes an extra turn after this one. Shuffle this card into its owner's library."
Revival // Revenge74%
$0.44↓#6240↓0.22↓7.7 years↓
"Double your life total. Target opponent loses half their life, rounded up."