Celestine, the Living Saint 

Legendary Creature — Human Warrior
$24.50 #2863 0.41 3.9 years
Flying, lifelink
Healing Tears — At the beginning of your end step, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of life you gained this turn.
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Cards similar to Celestine, the Living Saint 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.
Moseo, Vein's New Dean92%
$0.77↓#4676↓0.00↓0.4 years↓
"At the beginning of your end step, if you gained life this turn, return up to one target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of life you gained this turn."
Rodolf Duskbringer88%
$3.90↓#6000↓0.503.8 years
"At the beginning of your end step, you may pay 
. When you do, return target creature card with mana value X or less from your graveyard to the battlefield, where X is the amount of life you gained this turn."
+1 more matching line
Sister Hospitaller83%
$12.22↓#6278↓0.333.9 years
"When this creature enters, return target creature card from your graveyard to the battlefield. You gain life equal to its mana value."
Helping Hand83%
$0.28↓#5093↓0.332.8 years↓
"Return target creature card with mana value 3 or less from your graveyard to the battlefield tapped."
Necropanther82%
$0.12↓#12683↓0.25↓6.4 years↑
"Whenever this creature mutates, return target creature card with mana value 3 or less from your graveyard to the battlefield."
Order of Whiteclay82%
$0.33↓#13853↓0.00↓18.3 years↑
"

,
: Return target creature card with mana value 3 or less from your graveyard to the battlefield."
Bishop of Rebirth80%
$0.39↓#11480↓0.368.9 years↑
"Whenever this creature attacks, you may return target creature card with mana value 3 or less from your graveyard to the battlefield."
Extraction Specialist80%
$0.31↓#13403↓0.26↓4.4 years
"When this creature enters, return target creature card with mana value 2 or less from your graveyard to the battlefield. That creature can't attack or block for as long as you control this creature."
+1 more matching line
Betor, Ancestor's Voice79%
$1.24↓#5347↓0.381.4 years↓
"At the beginning of your end step, put a number of +1/+1 counters on up to one other target creature you control equal to the amount of life you gained this turn. Return up to one target creature card with mana value less than or equal to the amount of life you lost this turn from your graveyard to the battlefield."
+1 more matching line
Sigardian Savior79%
$0.36↓#21720↓0.27↓4.9 years↑
"When this creature enters, if you cast it, return up to two target creature cards with mana value 2 or less from your graveyard to the battlefield."
Abiding Grace78%
$0.28↓#8608↓0.315.2 years↑
"• Return target creature card with mana value 1 from your graveyard to the battlefield."
+1 more matching line