Leeches 
Sorcery
$3.05 #27463 0.06 31.1 years
Target player loses all poison counters. Leeches deals that much damage to that player.
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Cards similar to Leeches 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.
Suncleanser76%
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"• Target opponent loses all counters. That player can't get counters for as long as this creature remains on the battlefield."
Final Act72%
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"• Each opponent loses all counters."
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"• Remove all counters from target creature."