Delif's Cone {0}
Artifact
{T}, Sacrifice this artifact: This turn, when target creature you control attacks and isn't blocked, you may gain life equal to its power. If you do, it assigns no combat damage this turn.
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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.
Golden Urn 86%
$0.24#18932
"{T}, Sacrifice this artifact: You gain life equal to the number of charge counters on this artifact."
Dark Sphere 86%
$7.34#11454
"{T}, Sacrifice this artifact: The next time a source of your choice would deal damage to you this turn, prevent half that damage, rounded down."
Wedding Invitation 85%
$0.25#8140
"{T}, Sacrifice this artifact: Target creature can't be blocked this turn. If it's a Vampire, it also gains lifelink until end of turn."