Witherscale Wurm 
Creature — Wurm
$0.78 #20123 0.62 18.3 years
Whenever this creature blocks or becomes blocked by a creature, that creature gains wither until end of turn. (It deals damage to creatures in the form of -1/-1 counters.)
Whenever this creature deals damage to an opponent, remove all -1/-1 counters from it.
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Cards similar to Witherscale Wurm 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 deals combat damage to a player, remove all -1/-1 counters from it."
+1 more matching line
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$0.57↓#28837↓0.24↓29.6 years↑
"At the beginning of your upkeep, remove a -1/-1 counter from this creature."
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"At the beginning of your upkeep, put a -1/-1 counter on this creature."
Reluctant Dounguard76%
$0.08↓#225520.00↓0.6 years↓
"This creature enters with two -1/-1 counters on it."
Encumbered Reejerey76%
$0.11↓#225690.00↓0.6 years↓
"This creature enters with three -1/-1 counters on it."
Goblin Elite Infantry76%
$0.06↓#30198↓0.5329.9 years↑
"Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn."
Moonshadow76%
$12.60↑#8447↑0.00↓0.6 years↓
"This creature enters with six -1/-1 counters on it."
Heirloom Auntie74%
$0.13↓#15470↑0.00↓0.6 years↓
"This creature enters with two -1/-1 counters on it."
Belligerent Hatchling74%
$0.16↓#28434↓0.26↓18.1 years
"This creature enters with four -1/-1 counters on it."
Creakwood Safewright74%
$0.18↓#15906↑0.00↓0.6 years↓
"This creature enters with three -1/-1 counters on it."
Voracious Hatchling74%
$0.18↓#29474↓0.08↓18.1 years
"This creature enters with four -1/-1 counters on it."
Flailing Drake74%
$0.16↓#31982↓0.24↓28.9 years↑
"Whenever this creature blocks or becomes blocked by a creature, that creature gets +1/+1 until end of turn."
Morselhoarder74%
$0.37↓#198870.00↓18.3 years
"This creature enters with two -1/-1 counters on it."
Noxious Hatchling74%
$0.39↓#199990.27↓18.1 years
"This creature enters with four -1/-1 counters on it."
+1 more matching line
Shrewd Hatchling74%
$0.06↓#27739↓0.07↓18.1 years
"This creature enters with four -1/-1 counters on it."
+1 more matching line
Bristlebane Battler73%
$0.29↓#11050↑0.00↓0.6 years↓
"This creature enters with five -1/-1 counters on it."
Jungle Wurm72%
$0.10↓#31261↓0.40↓29.9 years↑
"Whenever this creature becomes blocked, it gets -1/-1 until end of turn for each creature blocking it beyond the first."
Johtull Wurm72%
$0.22↓#31364↓0.36↓31.3 years↑
"Whenever this creature becomes blocked, it gets -2/-1 until end of turn for each creature blocking it beyond the first."
Sturdy Hatchling72%
$0.12↓#28533↓0.40↓18.1 years
"This creature enters with four -1/-1 counters on it."
Deity of Scars72%
$1.30↑#234620.28↓18.1 years
"This creature enters with two -1/-1 counters on it."