Wildwood Scourge 
Creature — Hydra
$0.23 #3729 0.31 6.2 years
This creature enters with X +1/+1 counters on it.
Whenever one or more +1/+1 counters are put on another non-Hydra creature you control, put a +1/+1 counter on this creature.
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Cards similar to Wildwood Scourge 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.
Enduring Scalelord86%
$0.13↓#11165↓0.20↓11.4 years↑
"Whenever one or more +1/+1 counters are put on another creature you control, you may put a +1/+1 counter on this creature."
Botanical Brawler86%
$0.32↑#6758↓0.273.4 years↓
"Whenever one or more +1/+1 counters are put on another permanent you control, if it's the first time +1/+1 counters have been put on that permanent this turn, put a +1/+1 counter on this creature."
+1 more matching line
Knight of Wundagore86%
$0.09↓#21078↓0.00↓0.2 years↓
"Whenever you put a +1/+1 counter on another creature, put a +1/+1 counter on this creature. This ability triggers only once each turn."
Junk Golem84%
$0.29↑#30022↓0.2724.9 years↑
"This creature enters with three +1/+1 counters on it."
Hagra Constrictor84%
$0.18↓#9142↓0.295.9 years
"This creature enters with two +1/+1 counters on it."
Fairgrounds Trumpeter82%
$0.10↓#19573↓0.53↑9.9 years↑
"At the beginning of each end step, if a +1/+1 counter was put on a permanent under your control this turn, put a +1/+1 counter on this creature."
Walking Archive82%
$3.25↑#12260↓0.00↓20.3 years↑
"This creature enters with a +1/+1 counter on it."
Scrounging Bandar81%
$0.15↓#8773↓0.299.6 years↑
"This creature enters with two +1/+1 counters on it."
Lily Bowen, Raging Grandma81%
$0.51↑#6967↓0.00↓2.5 years↓
"this card enters with two +1/+1 counters on it."
Mossborn Hydra80%
$12.69↑#777↑0.75↑1.8 years↓
"This creature enters with a +1/+1 counter on it."
Swarm of Bloodflies80%
$0.09↓#13737↓0.50↑11.9 years↑
"This creature enters with two +1/+1 counters on it."
Salt Road Quartermasters80%
$0.05↓#28968↓0.3611.4 years↑
"This creature enters with two +1/+1 counters on it."
Noosegraf Mob80%
$0.29↑#10793↓0.3310.1 years↑
"This creature enters with five +1/+1 counters on it."
Big Mother Mouser80%
$2.05↑#5279↓0.00↓0.5 years↓
"This creature enters with two +1/+1 counters on it."
Selfless Police Captain80%
$0.05↓#15459↓0.231.0 years↓
"This creature enters with a +1/+1 counter on it."
Anthroplasm80%
$0.59↑#25855↓0.3327.6 years↑
"This creature enters with two +1/+1 counters on it."
Kalonian Hydra79%
$5.87↑#1120↑0.45↑13.1 years↑
"This creature enters with four +1/+1 counters on it."
Adaptive Shimmerer79%
$0.12↓#23169↓0.00↓6.4 years
"This creature enters with three +1/+1 counters on it."
Faithful Watchdog79%
$0.17↓#8717↓0.242.2 years↓
"This creature enters with three +1/+1 counters on it."
Steel Dromedary79%
$0.17↓#23592↓0.00↓5.2 years
"This creature enters tapped with two +1/+1 counters on it."