Living Armor {4}
Artifact
{T}, Sacrifice this artifact: Put X +0/+1 counters on target creature, where X is that creature's mana value.
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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.
Dwarven Weaponsmith 87%
#24024
"{T}, Sacrifice an artifact: Put a +1/+1 counter on target creature. Activate only during your upkeep."