Buried Treasure {2}
Artifact — Treasure
{T}, Sacrifice this artifact: Add one mana of any color.
{5}, Exile this card from your graveyard: Discover 5. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 5 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)
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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.
Chromatic Sphere 90%
$0.37#5167
"{1}, {T}, Sacrifice this artifact: Add one mana of any color. Draw a card."
Barbed Sextant 90%
#18472
"{1}, {T}, Sacrifice this artifact: Add one mana of any color. Draw a card at the beginning of the next turn's upkeep."
Glittering Stockpile 87%
$0.40#2228
"{T}, Sacrifice this artifact: Add X mana of any one color, where X is the number of stash counters on this artifact."
Lotus Blossom 85%
$0.40#11571
"{T}, Sacrifice this artifact: Add X mana of any one color, where X is the number of petal counters on this artifact."
Implements of Sacrifice 81%
$0.61#27683
"{1}, {T}, Sacrifice this artifact: Add two mana of any one color."