Starlit Soothsayer 

Creature — Bat Cleric
$0.18 #11356 0.00 2.2 years
Flying
At the beginning of your end step, if you gained or lost life this turn, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)
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Cards similar to Starlit Soothsayer 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.
Vanguard Seraph90%
$0.17↓#104960.10↑1.9 years
"Whenever you gain life for the first time each turn, surveil 1."
MACH-1, Swooping Scoundrel88%
$0.26↑#25846↓0.27↑0.3 years↓
"When this card enters and whenever you gain life, surveil 1. This ability triggers only once each turn."
Enlightened Confidant83%
$7.69↑#127780.16↑0.0 years↓
"At the beginning of your end step, if you gained life this turn, surveil 1. If you put a card with mana value less than or equal to the amount of life you gained this turn into your graveyard this way, put that card into your hand."
Basilica Stalker78%
$0.11↓#22119↓0.002.7 years
"Whenever this creature deals combat damage to a player, you gain 1 life and surveil 1."