Sanctum Seeker 
Creature — Vampire Knight
$0.30 #2321 0.28 8.9 years
Whenever a Vampire you control attacks, each opponent loses 1 life and you gain 1 life.
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Cards similar to Sanctum Seeker 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.
Malakir Bloodwitch88%
$4.27↑#3528↓0.3116.9 years↑
"When this creature enters, each opponent loses life equal to the number of Vampires you control. You gain life equal to the life lost this way."
Arterial Flow88%
$0.40↑#8631↓0.46↑8.6 years
"Each opponent discards two cards. If you control a Vampire, each opponent loses 2 life and you gain 2 life."
Sanguine Syphoner88%
$0.19↓#6561↓0.11↓1.8 years↓
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Mavren Fein, Dusk Apostle84%
$0.43↑#3791↓0.238.9 years
"Whenever one or more nontoken Vampires you control attack, create a 1/1 white Vampire creature token with lifelink."
Campaign of Vengeance84%
$0.25↓#12565↓0.3210.1 years↑
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Agate-Blade Assassin84%
$0.15↓#8985↓0.00↓2.1 years↓
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Drana's Emissary84%
$0.35↑#6604↓0.2210.9 years↑
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Dogged Pursuit84%
$0.26↓#12690↓0.255.6 years↓
"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Tenured Inkcaster83%
$0.09↓#13962↓0.00↓5.4 years↓
"Whenever a creature you control with a +1/+1 counter on it attacks, each opponent loses 1 life and you gain 1 life."
Kalastria Highborn82%
$0.16↓#11809↓0.2116.6 years↑
"Whenever this creature or another Vampire you control dies, you may pay . If you do, target player loses 2 life and you gain 2 life."
. If you do, target player loses 2 life and you gain 2 life."
Bishop of the Bloodstained82%
$0.23↓#16997↓0.62↑8.9 years
"When this creature enters, target opponent loses 1 life for each Vampire you control."
Mishra, Claimed by Gix81%
$6.23↑#6812↓0.293.8 years↓
"Whenever you attack, each opponent loses X life and you gain X life, where X is the number of attacking creatures. If this card and a creature named Phyrexian Dragon Engine are attacking, and you both own and control them, exile them, then meld them into this card, Lost to Phyrexia. It enters tapped and attacking."
Subversion80%
$2.15↑#16719↓0.00↓27.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Agent of Masks80%
$0.12↓#17800↓0.07↓20.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Vampire Neonate80%
$0.13↓#15398↓0.00↓8.1 years
", 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Whiplash, Vengeful Engineer80%
$0.16↓#19709↓0.00↓0.2 years↓
"Whenever this card attacks, if he's equipped, each opponent loses X life and you gain X life, where X is the number of Equipment attached to him."
Ragged Recluse // Odious Witch78%
$0.03↓#25725↓0.244.8 years↓
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Insatiable Hemophage78%
$0.23↓#9030↓0.376.4 years↓
"Whenever this creature mutates, each opponent loses X life and you gain X life, where X is the number of times this creature has mutated."
Raven of Fell Omens78%
$0.20↓#11457↓0.06↓2.4 years↓
"Whenever you commit a crime, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn."
Vampire Opportunist78%
$0.17↓#25216↓0.06↓7.3 years↓
"
: Each opponent loses 2 life and you gain 2 life."
: Each opponent loses 2 life and you gain 2 life."