Archnemesis {1}{U}{B}
Enchantment — Aura
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 that do something similar 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.