Synod Centurion 
Artifact Creature — Construct
$0.08 #31386 0.07 22.4 years
When you control no other artifacts, sacrifice this creature.
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Cards similar to Synod Centurion 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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"When this creature enters, sacrifice it unless you sacrifice an artifact."
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"At the beginning of the end step, if you control no artifacts, sacrifice this land."
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"When there are no creatures on the battlefield, sacrifice this enchantment."
Afiya Grove70%
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"When this enchantment has no +1/+1 counters on it, sacrifice it."