Bio-Asset Allocator 
Artifact Creature — Borg
$6.68 #21900 0.00 0.0 years
Artifact creatures you control have "Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
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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.
Sanguine Syphoner90%
$0.20↓#6489↑0.002.0 years↑
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Campaign of Vengeance90%
$0.26↓#13048↑0.0010.3 years↑
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Tenured Inkcaster89%
$0.12↓#14432↑0.10↑5.6 years↑
"Whenever a creature you control with a +1/+1 counter on it attacks, each opponent loses 1 life and you gain 1 life."
Agate-Blade Assassin87%
$0.23↓#9530↑0.002.3 years↑
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Dogged Pursuit87%
$0.18↓#13022↑0.33↑5.8 years↑
"At the beginning of your end step, each opponent loses 1 life and you gain 1 life."
Drana's Emissary87%
$0.36↓#6839↑0.0611.1 years↑
"At the beginning of your upkeep, each opponent loses 1 life and you gain 1 life."
Mishra, Claimed by Gix85%
$7.34↑#6846↑0.17↑4.0 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."
Subversion84%
$1.92↓#17155↑0.0027.7 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
Agent of Masks84%
$0.14↓#180450.22↑20.8 years↑
"At the beginning of your upkeep, each opponent loses 1 life. You gain life equal to the life lost this way."
HYDRA Infiltration83%
$0.14↓#202800.21↑0.4 years
"Whenever a creature you control attacks alone, target opponent loses 1 life and you gain 1 life."
Sanctum Seeker83%
$0.34↓#2373↑0.22↑9.1 years↑
"Whenever a Vampire you control attacks, each opponent loses 1 life and you gain 1 life."
Vampire Neonate83%
$0.15↓#15672↑0.068.3 years↑
"
, 
: Each opponent loses 1 life and you gain 1 life."
, : Each opponent loses 1 life and you gain 1 life."
Whiplash, Vengeful Engineer82%
$0.15↓#185540.41↑0.4 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."
Pactdoll Terror82%
$0.28↓#7511↑0.13↑1.7 years↑
"Whenever this creature or another artifact you control enters, each opponent loses 1 life and you gain 1 life."
Ragged Recluse // Odious Witch81%
$0.04↓#261630.005.0 years↑
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Insatiable Hemophage81%
$0.22↓#9234↑0.15↑6.6 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 Omens80%
$0.18↓#11764↑0.29↑2.6 years↑
"Whenever you commit a crime, each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn."
Reaper's Talisman80%
$0.17↓#13253↑0.18↑5.3 years↑
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."
Vampire Opportunist80%
$0.17↓#257630.007.5 years↑
"
: Each opponent loses 2 life and you gain 2 life."
: Each opponent loses 2 life and you gain 2 life."
Skirmish Rhino80%
$0.22↓#17270↑0.061.6 years↑
"When this creature enters, each opponent loses 2 life and you gain 2 life."