Vanguard Seraph 

Creature — Angel Warrior
$0.19 #11144 0.13 1.8 years
Flying
Whenever you gain life for the first time each 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 Vanguard Seraph 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.
MACH-1, Swooping Scoundrel97%
$0.28↑#26549↓0.00↓0.2 years↓
"When this card enters and whenever you gain life, surveil 1. This ability triggers only once each turn."
Starlit Soothsayer87%
$0.19#109660.062.1 years
"At the beginning of your end step, if you gained or lost life this turn, surveil 1."
+1 more matching line
Nightveil Sprite86%
$0.11↓#7481↑0.057.9 years↑
"Whenever this creature attacks, surveil 1."
+1 more matching line
Underwater Tunnel // Slimy Aquarium86%
$0.18↓#111060.171.9 years
"When you unlock this door, surveil 2."