Unstable Obelisk {3}
Artifact
{T}: Add {C}.
{7}, {T}, Sacrifice this artifact: Destroy target permanent.
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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.
Bumbleflower's Sharepot 93%
$0.14#8567
"{5}, {T}, Sacrifice this artifact: Destroy target nonland permanent. Activate only as a sorcery."
Thaumaton Torpedo 91%
$0.10#19940
"{6}, {T}, Sacrifice this artifact: Destroy target nonland permanent. This ability costs {3} less to activate if you attacked with a Spacecraft this turn."