Aettir and Priwen 
Legendary Artifact — Equipment
$11.72 #2874 0.45 1.2 years
Equipped creature has base power and toughness X/X, where X is your life total.
Equip 
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Cards similar to Aettir and Priwen 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.
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"Equipped creature has lifelink."
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"this card's power and toughness are each equal to your life total."
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"
: Target creature you control has base power and toughness 7/7 until end of turn."
: Target creature you control has base power and toughness 7/7 until end of turn."