Green Slime 

Creature — Ooze
$1.55 #5604 0.27 4.2 years
Flash
When this creature enters, counter target activated or triggered ability from an artifact or enchantment source. If a permanent's ability is countered this way, destroy that permanent.
Foretell
(During your turn, you may pay
and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
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Cards similar to Green Slime 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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"Foretell 
During your turn, you may pay
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"Foretell 
During your turn, you may pay
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"Foretell 

During your turn, you may pay
and exile this card from your hand face down. Cast it on a later turn for its foretell cost."
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"Foretell 
During your turn, you may pay
and exile this card from your hand face down. Cast it on a later turn for its foretell cost."
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During your turn, you may pay
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"Foretell 
During your turn, you may pay
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"Foretell 
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