Witherscale Wurm 
Creature — Wurm
$0.78 #20517 0.00 18.5 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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$0.59↓#29221↓0.0029.7 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%
$0.07↓#225820.030.7 years↓
"This creature enters with two -1/-1 counters on it."
Encumbered Reejerey76%
$0.16↓#225560.040.7 years↓
"This creature enters with three -1/-1 counters on it."
Goblin Elite Infantry76%
$0.09↓#30391↓0.0030.0 years↑
"Whenever this creature blocks or becomes blocked, it gets -1/-1 until end of turn."
Moonshadow76%
$17.38↑#8141↑0.17↑0.7 years↓
"This creature enters with six -1/-1 counters on it."
Belligerent Hatchling74%
$0.16↓#28780↓0.0018.2 years
"This creature enters with four -1/-1 counters on it."
Heirloom Auntie74%
$0.17↓#15285↑0.040.7 years↓
"This creature enters with two -1/-1 counters on it."
Creakwood Safewright74%
$0.16↓#15859↑0.040.7 years↓
"This creature enters with three -1/-1 counters on it."
Voracious Hatchling74%
$0.17↓#29729↓0.0018.2 years
"This creature enters with four -1/-1 counters on it."
Flailing Drake74%
$0.14↓#32274↓0.0029.0 years↑
"Whenever this creature blocks or becomes blocked by a creature, that creature gets +1/+1 until end of turn."
Morselhoarder74%
$0.39↓#199820.0718.5 years
"This creature enters with two -1/-1 counters on it."
Noxious Hatchling74%
$0.38↓#203520.21↑18.2 years
"This creature enters with four -1/-1 counters on it."
+1 more matching line
Shrewd Hatchling74%
$0.05↓#28090↓0.0618.2 years
"This creature enters with four -1/-1 counters on it."
+1 more matching line
Jungle Wurm72%
$0.09↓#31636↓0.0030.0 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↓#31616↓0.50↑31.4 years↑
"Whenever this creature becomes blocked, it gets -2/-1 until end of turn for each creature blocking it beyond the first."
Bristlebane Battler72%
$0.30↓#10765↑0.070.7 years↓
"This creature enters with five -1/-1 counters on it."
Sturdy Hatchling72%
$0.13↓#28878↓0.0018.2 years
"This creature enters with four -1/-1 counters on it."
Deity of Scars72%
$1.26↑#238040.19↑18.2 years
"This creature enters with two -1/-1 counters on it."