Mana Crypt 
Artifact
At the beginning of your upkeep, flip a coin. If you lose the flip, this artifact deals 3 damage to you.
{T}: Add {C}{C}.
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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.
Planar Chaos 88%
$2.25#7067
"At the beginning of your upkeep, flip a coin. If you lose the flip, sacrifice this enchantment."