Agent of Masks 
Creature — Human Advisor
$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.
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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.
Subversion100%
$2.15↑#167190.0027.6 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Drana's Emissary97%
$0.35↑#6604↑0.22↑10.9 years↓
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Dogged Pursuit96%
$0.26↑#12690↑0.25↑5.6 years↓
"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Tithing Blade // Consuming Sepulcher95%
$0.39↑#4729↑0.33↑2.8 years↓
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Exsanguinate95%
$0.39↑#281↑0.76↑15.9 years↓
"Each opponent loses X life. You gain life equal to the life lost this way."
Blood Tithe95%
$0.28↑#10873↑0.1216.1 years↓
"Each opponent loses 3 life. You gain life equal to the life lost this way."
Chancellor of the Dross93%
$1.18↑#171400.53↑15.3 years↓
"You may reveal this card from your opening hand. If you do, at the beginning of the first upkeep, each opponent loses 3 life, then you gain life equal to the life lost this way."
Scholar of Athreos93%
$0.11↓#23784↓0.33↑12.9 years↓
"
: Each opponent loses 1 life. You gain life equal to the life lost this way."
: Each opponent loses 1 life. You gain life equal to the life lost this way."
Debt to the Deathless92%
$0.41↑#2544↑0.47↑13.3 years↓
"Each opponent loses two times X life. You gain life equal to the life lost this way."
Vampire Neonate92%
$0.13↑#153980.008.1 years↓
", 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Skirmish Rhino92%
$0.23↑#170430.161.4 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Sneering Shadewriter92%
$0.13↑#210760.000.4 years↓
"When this creature enters, each opponent loses 2 life and you gain 2 life."
Sinister Monolith90%
$0.31↑#6244↑0.33↑2.1 years↓
"At the beginning of combat on your turn, each opponent loses 1 life and you gain 1 life."
Insatiable Hemophage90%
$0.23↑#9030↑0.37↑6.4 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."
Vampire Opportunist90%
$0.17↑#25216↓0.067.3 years↓
"
: Each opponent loses 2 life and you gain 2 life."
: Each opponent loses 2 life and you gain 2 life."
Sanguine Syphoner90%
$0.19↑#6561↑0.111.8 years↓
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Creeping Bloodsucker90%
$4.81↑#1534↑0.23↑3.8 years↓
"At the beginning of your upkeep, this creature deals 1 damage to each opponent. You gain life equal to the damage dealt this way."
Urborg Syphon-Mage90%
$0.03↓#211510.39↑19.9 years
", , Discard a card: Each other player loses 2 life. You gain life equal to the life lost this way."
, , Discard a card: Each other player loses 2 life. You gain life equal to the life lost this way."
Servant of Tymaret89%
$0.18↑#187990.50↑12.6 years↓
"Whenever this creature becomes untapped, each opponent loses 1 life. You gain life equal to the life lost this way."
Tormented Hero89%
$0.11↓#22883↓0.25↑12.9 years↓
"Whenever you cast a spell that targets this creature, each opponent loses 1 life. You gain life equal to the life lost this way."