Yawgmoth Demon 
Creature — Phyrexian Demon
$0.37 #28646 0.40 32.5 years
Flying (This creature can't be blocked except by creatures with flying or reach.)
First strike (This creature deals combat damage before creatures without first strike.)
At the beginning of your upkeep, you may sacrifice an artifact. If you don't, tap this creature and it deals 2 damage to you.
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Cards similar to Yawgmoth Demon 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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"At the beginning of your upkeep, this creature deals 5 damage to you unless you sacrifice a creature other than this creature. If this creature deals damage to you this way, tap it."
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"At the beginning of your upkeep, you may sacrifice an artifact, enchantment, or token. If you don't, tap this creature."
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"At the beginning of your upkeep, tap this creature unless you sacrifice another creature."
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"At the beginning of your upkeep, this creature deals 8 damage to you unless you pay 
."
."