Mindbender Spores 

Creature — Fungus Wall
$1.42 #22216 0.63 30.0 years
Defender (This creature can't attack.)
Flying
Whenever this creature blocks a creature, put four fungus counters on that creature. The creature gains "This creature doesn't untap during your untap step if it has a fungus counter on it" and "At the beginning of your upkeep, remove a fungus counter from this creature."
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Cards similar to Mindbender Spores 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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"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
+1 more matching line
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"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
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"Whenever this creature blocks a creature, that creature doesn't untap during its controller's next untap step."
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"Whenever this creature blocks a creature, tap that creature. That creature doesn't untap during its controller's next untap step."
+1 more matching line
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"Whenever this creature blocks, remove an ice counter from it."
+1 more matching line