Archnemesis 
Enchantment — Aura
$0.31 #12453 0.00 0.2 years
Enchant opponent
Whenever you attack enchanted player, that player loses 2 life. You draw a card and gain 2 life.
Whenever a player attacks you, you may attach this Aura to that player.
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Cards similar to Archnemesis 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.
Curse of Verbosity87%
$0.49↑#3792↑0.49↑9.0 years↑
"Enchant player"
+1 more matching line
Campaign of Vengeance86%
$0.25↓#125650.32↑10.1 years↑
"Whenever a creature you control attacks, defending player loses 1 life and you gain 1 life."
Curse of the Forsaken86%
$0.27↓#17050↓0.31↑12.8 years↑
"Enchant player"
+1 more matching line
Shroudstomper84%
$0.33↑#9889↑0.19↑1.9 years↑
"Whenever this creature enters or attacks, each opponent loses 2 life. You gain 2 life and draw a card."
Trespasser's Curse84%
$0.40↑#5150↑0.24↑9.4 years↑
"Enchant player"
+1 more matching line
Parasitic Impetus83%
$0.13↓#2816↑0.19↑6.4 years↑
"Whenever enchanted creature attacks, its controller loses 2 life and you gain 2 life."
+1 more matching line
Curse of Vitality82%
$1.24↑#124670.20↑9.0 years↑
"Enchant player"
+1 more matching line
Agate-Blade Assassin82%
$0.15↓#8985↑0.002.1 years↑
"Whenever this creature attacks, defending player loses 1 life and you gain 1 life."
Accursed Witch // Infectious Curse81%
$0.26↓#106500.43↑10.4 years↑
"Enchant player"
+1 more matching line
Curse of Leeches // Leeching Lurker80%
$0.32↑#140940.38↑4.9 years↑
"Enchant player"
+1 more matching line
Military Intelligence80%
$0.27↓#6308↑0.15↑12.1 years↑
"Whenever you attack with two or more creatures, draw a card."
Mishra, Claimed by Gix80%
$6.23↑#6812↑0.29↑3.8 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."
Coercive Impetus79%
$0.33↑#7325↑0.000.4 years
"Whenever enchanted creature attacks, you draw a card and lose 1 life."
Reaper's Talisman79%
$0.14↓#131240.055.1 years↑
"Whenever equipped creature attacks alone, defending player loses 2 life and you gain 2 life."
Sokka, Lateral Strategist79%
$0.19↓#7600↑0.000.8 years
"Whenever this card and at least one other creature attack, draw a card."
Knights of the Black Rose79%
$0.33↑#118630.0010.0 years↑
"Whenever an opponent becomes the monarch, if you were the monarch as the turn began, that player loses 2 life and you gain 2 life."
HYDRA Infiltration78%
$0.13↓#21973↓0.000.2 years
"Whenever a creature you control attacks alone, target opponent loses 1 life and you gain 1 life."
Curse of Fool's Wisdom77%
$5.22↑#6638↑0.95↑7.0 years↑
"Enchant player"
+1 more matching line
Sanguine Syphoner77%
$0.19↓#6561↑0.11↑1.8 years↑
"Whenever this creature attacks, each opponent loses 1 life and you gain 1 life."
Foul-Tongue Shriek77%
$0.25↓#109720.63↑11.4 years↑
"Target opponent loses 1 life for each attacking creature you control. You gain that much life."