Biorhythm 
Sorcery
$34.43 #9841 0.00 23.9 years
Each player's life total becomes the number of creatures they control.
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Cards similar to Biorhythm 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.
Reverse the Sands78%
$0.82↓#12416↓1.11↑21.9 years↓
"Redistribute any number of players' life totals."
Touch of the Eternal78%
$0.18↓#28897↓0.65↑14.1 years↓
"At the beginning of your upkeep, count the number of permanents you control. Your life total becomes that number."
Shaman of Forgotten Ways77%
$8.63↓#6555↑0.36↑11.4 years↓
"
, 
: Each player's life total becomes the number of creatures they control. Activate only if creatures you control have total power 8 or greater."
, : Each player's life total becomes the number of creatures they control. Activate only if creatures you control have total power 8 or greater."
Repay in Kind76%
$3.94↓#7750↑0.30↑16.4 years↓
"Each player's life total becomes the lowest life total among all players."
Congregate76%
$0.14↓#5332↑0.0627.9 years↑
"Target player gains 2 life for each creature on the battlefield."
Oketra's Last Mercy76%
$0.37↓#17359↓0.35↑9.1 years↓
"Your life total becomes equal to your starting life total. Lands you control don't untap during your next untap step."
Peach Garden Oath74%
$0.33↓#21177↓0.14↑27.3 years↑
"You gain 2 life for each creature you control."
Festival of Trokin74%
$1.52↓#22912↓0.21↑28.2 years↑
"You gain 2 life for each creature you control."
Psychic Transfer74%
$0.32↓#31377↓0.36↑29.9 years↑
"If the difference between your life total and target player's life total is 5 or less, exchange life totals with that player."
Profane Transfusion74%
$1.30↓#7124↑0.39↑5.8 years↓
"Two target players exchange life totals. You create an X/X colorless Horror artifact creature token, where X is the difference between those players' life totals."
Gruesome Fate74%
$0.24↓#7408↑0.41↑8.6 years↓
"Each opponent loses 1 life for each creature you control."
Invincible Hymn73%
$3.42↓#13659↓0.71↑17.9 years↓
"Count the number of cards in your library. Your life total becomes that number."
Alive // Well72%
$0.06↓#21464↓0.0613.3 years↓
"You gain 2 life for each creature you control."
Axis of Mortality72%
$1.26↓#113840.96↑8.9 years↓
"At the beginning of your upkeep, you may have two target players exchange life totals."
Arbiter of Knollridge71%
$0.31↓#13748↓0.29↑18.9 years↓
"When this creature enters, each player's life total becomes the highest life total among all players."